Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a5c5a331c52004…

MALICIOUS

PDF

94.3 KB Created: 2021-08-04 03:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7701923450aad99450a50911f9e8ab94 SHA-1: f3b212c27e69991aa816fd94687a04bf81881498 SHA-256: f1a5c5a331c520042ebd199c961daf714ffa366ff343f9a8cb09a957f853d9af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The presence of external URIs and the 'callback phishing phone lure' heuristic indicate an attempt to direct the user to malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://chcial.ru/uplcv?utm_term=55uk6360+lg+tv+price+in+india PDF link annotation
    • http://itineraire-consulting.com/ckfinder/userfiles/files/sidegarapuliseb.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b4f82f43028bac930cf8551db37035e4/rukogeli.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c22498e67f55913a32541e880abc8ecb/laxezi.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xujal.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c52de0108bf---mezasekivolo.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/dipesikewene.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/lirekavip.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kalezasar.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/dezebolapafokine.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4376f72816---23257735785.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1601350e7b55e6f2a0f8b9fb8a1921aa/pewezopojiporisoned.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf8c08295d---85256806957.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/11616226716.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7471b3b8e---vizosubikukuf.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/23762449833.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/rorubejesizebenoridaw.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/31264163067.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/72805816651.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b535b169---1044538118.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/86c9d67dd342fd940fdead3c73bde7fb/nirugurejosog.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5624f7ca16d7001f8d1484982eef8988/14599784197.pdfIn PDF document text
    • 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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 11160 bytes
SHA-256: d0e5f346e702eac1b17e140745d80d80e28f7c6bd331c8403073d83e312107c6
font_03_sfnt_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 17040 bytes
SHA-256: 021c11c5201432965e5beed040b3ff1afa145f417cd4108e96102bf3ade519d1

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