Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad42ce7cda0a33c…

MALICIOUS

PDF

109.8 KB Created: 2021-07-01 19:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f1fac1b058e5d9415dfafc84c72d7642 SHA-1: 1a2e02eb95b98ae9d8c918b22386ac65735b4dbc SHA-256: 7ad42ce7cda0a33c4ce040b3669a8b43d39f6e11f66cc86d155c7a14afe2e87b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=what+are+the+forms+of+quadratic+equations PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5280cec1---buvitidasumulin.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8de9d464ae7d14f0931f42c3eae46e6c/kebirobidilud.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/mozilivum.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/54467032327.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/47832444326.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/11975585299.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f0f3d76fd63d67614d4a67fab57b3720/51285465532.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jevojenozixipojemerex.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/47274068787.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622323807547948885.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/77696559961.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c40956f8c12a6906e98b96a11d308f12/gejolejaveg.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///vidiwazazefigagiso.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/89870672367.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fopotemutitamoregegetoza.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bd35d2f---25249023460.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/pofese.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6ae55ba11840e4b6ea0ce11114ccc4d/39177396128.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209046738b---wivarep.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a5c85aea---xixafewelevu.pdfIn PDF document text
    • https://le27.fr/docs/file/40247342795.pdfIn PDF document text
    • http://faradbox.pl/files/file/34139394899.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t21rh3o3oojifj7v81ljvl5607/49572731250.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095deaab5af8---2312365381.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 10936 bytes
SHA-256: 79c383756c4d741a31657bd02f591fbfef1a7861ed0ff9190c04b22a07f76a61
font_01_sfnt_off00016157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16157 18328 bytes
SHA-256: 36ae992397f97b56bcae8042ce5c07fcaaa2556640bb500c45a26302e0efb9a3
font_02_sfnt_off00019191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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