Malicious PDF — malware analysis report

Static analysis result for SHA-256 85558497a8be5409…

MALICIOUS

PDF

103.1 KB Created: 2021-06-26 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d4068ea5065b4f3dfbe5d5be5b98028 SHA-1: 48361c1483f1fc7743eb2cc8ae294ccf4a86a9fe SHA-256: 85558497a8be54096eae9255cbc7861a8012c6c4f502897af0984e31da885c9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The document's structure and the presence of external links indicate it is part of a phishing campaign designed to trick users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thaoduocquyhiem.com/userfiles/image/file/dolamefibesekaki.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094377b0878f---teponiwapepitapufob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9d81977eb283376b6919294642126a7c/44847038311.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9qduvvbm253l4r5ksauajmqbv1/9073651923.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9fa81752---869179224.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ffabf3e543bb1efeb18378f8c752c8a2/remaj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9730a6765a1376a41ce3841221123576/43998166681.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/75395452895.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c579a507956---bumubi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/99926647789.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf9e35a66---vuruxifuvapitemovo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9b75a56---lifeduwatufidukuketosok.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0b130a18---kudevozemavo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/33723801524.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff86669a62---neruvinadevibivope.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962b0b95a---17844722949.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/jasisamomamifulo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j8ri77uh9f5qdircebcn17evj0/982140529.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5700ed7d31ce547daed428349f66e2a7/xugokimakaxugoba.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/4639047015.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tornjgrlbp5sh90bnggphne4q3/madolalanonolalafiwotig.pdfIn PDF document text
    • https://ckmandarin.com/uploads/61791245521.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608731ba7db69---58308987110.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091747a58a3a---tomojox.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b7e1b63a172170376b4a6e0223879c7c/lupanapukepaxobegivozit.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vb4g9i3fih5qnv07nd45v17202/2171123523.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dc424f2defa1a6d98908164128569e5b/30486408363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=emissions+test+plymouth+wiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 18880 bytes
SHA-256: a08eb93398bfadf7d5acea5bad30a71d7021bec1f192f19d7593ceb0248d4c8c
font_01_sfnt_off0001487f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487F 10540 bytes
SHA-256: 5199397bd6322b9843490b1e28dbdfdb6531acd39606826c9c608a8032f69129
font_02_sfnt_off0001605a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001786b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786B 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d