Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9176ae8aafc4270…

MALICIOUS

PDF

124.6 KB Created: 2021-08-24 11:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f0a13e2e5c6d0755a8de0b8cb913acd SHA-1: 905928cfa6ac82c036cce80b42ab0284aded881f SHA-256: b9176ae8aafc42708cbdb7b044a4fac6a17738d7d55fd6cfdcae98db9c1c1ff7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://lhs75.com/clients/46937/File/wukovinar.pdf In PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/74535750460.pdfIn PDF document text
    • http://healthywithhart.com/res/file/34346969970.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/56e4db5a7ad56921167bdfeb60d6047d/nalibodunezafanu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xasije.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3635811a6b---82244689490.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/33408333257.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/26059788824.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24637beb7---bukod.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0ce7947a27370d9d93e71340f85e0590/xiwixedasov.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ddf6a677f0---mepolopunitabivaguxelun.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ncr5qqhhp73ra4imcerjduvenu/36957471833.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/45653876426.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/gufiximitofimogokaluj.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/92327228617.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b328df54---97928987508.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/20370746668.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f36b55cc9b7---25880771781.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-15/20210515062615658853.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/96503476037.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f5a14086---sinuwe.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/268htt3vj69blpvsll025a0mi3/vimebef.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/51731073470.pdfIn PDF document text
    • https://filetorme.com/upload/files/zenoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bringing+heaven+to+earth+scripturePDF link annotation
    • 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_off000187a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A1 16676 bytes
SHA-256: 48abe5916c9c1c038e898f9ce6c3359ab4c3ad56c6dd5d7e9d39ed12c8418f0a
font_01_sfnt_off0001b2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB0E 10824 bytes
SHA-256: 63e9df0db7972752f100597ae1a63f207bac2d7ea180aebc38cbcef4f3a6f874