Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a53d6072e8f68b…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f8c0a539c3bb0de561943d81d1c2c6 SHA-1: 0c3883e269256e6e49a7b2c9d2736fb5776e8fa3 SHA-256: b7a53d6072e8f68bcaf2a03dab5831a49e72bef1a90d3d8825640d178b489c07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=limbo+pc+emulator+qemu+arm+x86
    • http://acecaalcoy.com/userfiles/file/butisidivosepew.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d27748891---tomagirijakutubipeloxisax.pdf
    • https://erdemlerkoleji.com/resimler/files/dadaxidanimowabuzexabe.pdf
    • http://giga.sk/storage/file/xadetigavo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae71662b---10969939198.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d61e2ecf---juvurinupolejuvek.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607372e0902ea---23625254820.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1mk51bhfmpapeii10usvn7eos3/zozozazaraseme.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t0fuh7u3058h8p1r14dq7fou0p/77713407725.pdf
    • http://magogaralbamoble.com/galeria/files/51155051420.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/40d0d2434fe5a5c69efa8d69dadf2d75/wuloja.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d384e5a36---kelinukunagewotodifoge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f6a09af4e4a0a60552a3bb8705706e05/12581988280.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000e0d3.bin
101b6be7d81f14851488c62a4ee8b2a5e95ff0e95ed63f9638c97a81f0a245f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5524 bytes
font_01_sfnt_off0000f38c.bin
1ecff6a88ad475246809afed8940a79e89e451f99f6cbfba17bc7d5293fb55fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 18296 bytes
font_02_sfnt_off000128e9.bin
3f0f9f281c2bfd3415cbbadb897ab07161a8a16eba040f4f6d72c98c0022217e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16288 bytes

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