Malicious PDF — malware analysis report

Static analysis result for SHA-256 7947106ea9873a37…

MALICIOUS

PDF

74.5 KB Created: 2021-08-30 15:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 68d9be5956f708d00b1966eb7124381c SHA-1: a4d997e14a6423cdfd2d8f855eff6c8885c02fdf SHA-256: 7947106ea9873a379508042057f5f14d59a7f0e15943af3a6c78fcecd6a14582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=unravel+chapter+9 PDF link annotation
    • https://deltagroup.bg/uploads/file/lisiwigenifikadoseninipuj.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e93f486---11764629276.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/gejunimekudu.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/49574464331.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6091643835.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/65775311825.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af945c831f2---famujof.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/kafunudazobowizeluleju.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/betugujiv.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4135e2cf01f89b0d7d3013a393094d7b/xovozurazunezokuz.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e31a687b4---pewipibilojunuwenojogo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4c926997b31c770fe15e0218fba5afe5/34040855929.pdfIn PDF document text
    • http://jarosi.hu/files/file/xebifuzilun.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29d1cda070---48669915267.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/42379605296.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/38468112263.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s2qmvnosirbh1r046neth72ou6/dotipemojurunikatakasu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/liredalekakepelufog.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/gadorene.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/nilajojajariwu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/11/89787466805.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//45161456043.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/73746022308.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a895b4dfb---53795696715.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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 10332 bytes
SHA-256: 7b075153b992ef447eec324936a53ba8a5766016da9abc6ec4abc7beec602c2f
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16256 bytes
SHA-256: 354e26b2f2d92d44b49191bf5dd62b4b0406706275f11864ac3c19b22fb8d6ee
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1