Malicious PDF — malware analysis report

Static analysis result for SHA-256 b350aec98563ff7e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-15 15:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9d6f8fffbf8374d5c9fa63304a9570a SHA-1: f00854abd8ce02dff5e324c51f230f4392e5d3ef SHA-256: b350aec98563ff7e0dab32d7286571732dfcc772959a5a99c2f5c791869a6a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a phishing or credential harvesting attempt.

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://irlanc.ru/uplcv?utm_term=best+professional+cv+template+word PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e8d8c8a---filegeminodotewosopagulir.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/290c8e221b165a39b4c830fda511261c/tijexanimafotuziv.pdfIn PDF document text
    • https://go2germany.ru/files/file/kidapitowawapiwomovudi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dea907818627ab2a9cfd4e7b70f895ae/53941354471.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cfa858b4be588875e3069a99ee10eb82/zijalorinosenoxezoz.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/76441681619.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/deboxonifu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc26422e4b7a7a820d7590769d4290c5/70195431735.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f170a73758---58570657118.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jekozoxopetepegaka.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/bupejuxutofadozigupute.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/46683659846.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/betezen.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084498c126ad---komajiruwen.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904024e60---kuforusepineroruk.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/safapaxibotuma.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/lelaposavexo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/muveburefa.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/66908869893.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/30392e6d5f296c33f9fe3dc0df2d926a/78357644248.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/genuzomopige.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/7463880170.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/demajaxumagugulupavujel.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/83294057995.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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10984 bytes
SHA-256: 708bc1860d77188653af85e8b49672843aaae4b58abfff2a22c74a3791615675
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16524 bytes
SHA-256: d60ad0b269e91c5135bdf095024d2b7cd17db4b61525baf9a0c87d2a0644e457

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