Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d26dbf192dcdd8…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 01:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 614c2cbd1e7574506566e69d16bfe47d SHA-1: cb085d8881f9aff78797b988c39c9514e983fa02 SHA-256: 41d26dbf192dcdd8891c161b457a85326deb710af239ef188e91a3d03f724185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hizlipin.com/calisma2/files/uploads/demufi.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210708053744.pdf
    • http://tamker.hu/userfiles/file/libax.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d29044f25f0f4c9f7d760554ba9c58ec/kozogexuxelurabexulajul.pdf
    • https://hssanesteban.cl/files/varejabuj.pdf
    • http://vogiantinhmach.com/media/ftp/file/fixirir.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/lbgs2pb4t2himbdkj053gqh6jf/mamosuxazetetekesu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d82977d5f23---77897433255.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607805b139a07---6046901596.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rt3on82uscblni2m71n462fplm/48127108987.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac9eedaaf---fegewabinetosubojivur.pdf
    • http://gostinica-domodedovo.ru/files/28549662773.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/16522613325.pdf
    • http://btfa.tw/upload/files/65755149725.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf58492792---23328249946.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a0c6d2ae17cd64bc0bf75c942fd6c22e/vanusidosazivowizavarire.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/adab75ac1bfc98cec2674e8433f6e9a5/gobitejanademamitipidi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+omegle+tags+to+find+girls
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
font_01_sfnt_off00010adf.bin
04e9b359dbd350d75a71ff56b080df5d89107c1a553f982daf34565d7353174d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10752 bytes
font_02_sfnt_off0001235a.bin
63064ac783792a225db6eace29beffe0fc370f6f16af7cf8201451c113ea3e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 17388 bytes

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