Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a75e8de976505f1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a83f620673117cf8e65baf7e6bb9907 SHA-1: b7251e120bc2eb5d18e60843a736aa598500f77b SHA-256: 9a75e8de976505f15d6beeb5ffe4600512b6955b8550d1a342505c96996e5a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is minimal, with the primary function appearing to be the hosting and delivery of these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c8224daf60f932166f1919878d392fb8/34661227653.pdf In PDF document text
    • http://web68s.com/upload/files/weloju.pdfIn PDF document text
    • http://kbchina.de/upload/wisigupe.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/86760835342.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/wetumikegex.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/siwaleludakusexedogix.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621392661.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/devawaterew.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/31125434922.pdfIn PDF document text
    • https://ikima.fr/uploads/file/94414458575.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160755db38c242---64240726109.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/24780923128.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26ed45189---tutujipotavitukikexipejub.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49t73rkta2kf2jeba6sdr31u45/gaforisi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe914cac3c7---35635287728.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qdmv9lp9a61fkufd8o01ud544e/gubosufenafokef.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/38799490368.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aadfbf7b5c4---sifapem.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525039ed09---87253285089.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/zepetiw.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/regevipezapowovosumarefim.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053e5e77be---rodeki.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/31373456914.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc774a977e---fabemevuxone.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39e34f0b9---tewebikiben.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/65045231839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=markets+in+financial+instruments+directive+ii+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 17404 bytes
SHA-256: 9ce35bedf1f93d04e107df7978d3de8c6e6b27c56d80a9b1cb1df385184c9e13
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 10912 bytes
SHA-256: adc9f8d2804a0c72c4ddfe3cb8e871273298dc2a97b401a87ce7701eb30f677f

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