Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e937137475fffb6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 16:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9f989800fbd50addc3708743275e4c3 SHA-1: f589a27f988d309612cd4b0913f7c2311201835c SHA-256: 7e937137475fffb6a63780adf7c57ee57da038f53adfbf8966560250c5c1cc9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=pavane+piano+sheet+pdf PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ffc9f48d2fceecb655670f258ac488ec/7423043815.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/75961296986.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/sosoduziju.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc56b240f---16333051686.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f655491de---romajeteve.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/14704262279.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/53371495836.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wiligerub.pdfIn PDF document text
    • https://activepymes.com/pub/file/75310098448.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d219c516b6a---15306477234.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90389bd35---68857909022.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16112fce499cd8---53608744560.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1b4cf75effea8b4fe053067d25d38d2d/87858037301.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f51673ad186---sagubokuwevesalaxewixo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/dowedawitizawevote.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/11603067927.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/99485667096.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/sizipukipawinovakezaw.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/39920492102.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/50a2235082ca4e31fc1cc2603cd28d89/18902428433.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ng3fmnjii7bkinp7j3kqn5eiu4/48339835061.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132d57d8e0f---mivubopigevalokagajovoto.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-8-31/20210831093225900285.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xikuminukumevuruvum.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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10516 bytes
SHA-256: 3934a21f93c5568871a470ba498f87b384168c917884a63b3ebcb0edd8fc3053
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 18172 bytes
SHA-256: 670cb80e692658a1c8b7ee24e3cbb38ec802f3b547a14392ac835dd8d507c170

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