Malicious PDF — malware analysis report

Static analysis result for SHA-256 46834bc11df350c2…

MALICIOUS

PDF

80.7 KB Created: 2021-08-12 16:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47b90952bc02143404018dce4ab65085 SHA-1: 0f4654eb6f2903592d1467bd2e0e708f5edbf0d4 SHA-256: 46834bc11df350c22ffb6e4e21db3518a98da9fe314617416743abe60f6ae86b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, several of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://infoenergie-loire.org/userfiles/file/5614103499.pdf In PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/10761691778.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/mukoxi.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6snh7jlbkgma4h8pusptbsp9bq/nozep.pdfIn PDF document text
    • https://avenue102.com/uploads/file/50597164241.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/52524019884.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/70160922480.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/bagabe.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jagubuvivojirejidab.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/tewatoxanevebomafi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c476ce4aff7---35407202388.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/r6lcjvofb6bc947omoqnpsori1/84137812785.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/17838131656.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd6705ae9---72857205814.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160751bf19d84f---zamoxet.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wifetikitib.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52685404700.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/04872b672400a9b3a0556355a66fdec8/mevaserewo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7m4mt1asm7bvf1adhta3i64e8k/vatedagipo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/1f27a94f63717bb48ec381ce39a12a7a/bamuzegalomago.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/4854855310.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d749d90c03---kogijilufawizuloporalex.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a293a519f6a---gudosoxixes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=parole+la+ballade+des+gens+heureux+a+imprimerPDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 19044 bytes
SHA-256: 85871c39af2dcdf6e1d0e704ec7c8bd098088ba594c6ad4c0904d317be5cad43
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 11084 bytes
SHA-256: 5a19c72ae8d38b99e3be1add5ec6ebf3081235e64caa5f2707c99196938a72c0

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