Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f64251c1c3ee2…

MALICIOUS

PDF

96.0 KB Created: 2021-08-06 17:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddfe4c4c0c30499118f2f7d9c17e3108 SHA-1: 1eb1ef505fe82aaae1e224b7d991a217c2c0d209 SHA-256: 4a6f64251c1c3ee250c9d794579ab95c753cb16ad8556c4ae24153153fa9b4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/93381216f6bc864978821bc544c2f51e/20828462517.pdf
    • https://bodegoncriollo.com/userfiles/file/fovuf.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3324ba7ca193af24c4235c1391530e2f/4515359516.pdf
    • http://sineadstone.com/userfiles/file/96057528573.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e2195e8aa---mibojafutame.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed9d18452---14322262126.pdf
    • http://kppzp.pl/userfiles/file/13682524637.pdf
    • http://cancercareresearch.com/userfiles/file/detugenatotimejip.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4023e9c99---jalamufuf.pdf
    • http://saltyfeelings.com/userfiles/file/zunanefopuzewevupokedom.pdf
    • https://masihpt1.com/contents//files/58946252920.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/lapij.pdf
    • https://gites-les-bardots.com/userfiles/file/65733475155.pdf
    • http://bike-aholic.com/UserFiles/file/samegagi.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d911ba9e82df23973e5551c72cc3e017/47345952926.pdf
    • http://change-sexy.com/files/files/zafokadaxupalatebokiraxos.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83e86d29c---8015290442.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/72712263637.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2f3a29e8dced578e837b1a64dbc2decc/norako.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/sibimijebopizivemetufimu.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-19/20210519171338720363.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gravity+falls+journal+3+special+edition+all+blacklight+pages
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f3.bin
89d97a3d4722a8cd0906a3365d85177580f975b84b5d503d6917bd3cc4a31d29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 11752 bytes
font_01_sfnt_off00011291.bin
35c8704360ef0ece3d34ed3f7bbb6c3c525cf4f20eb6dbe4474ba9cb5028c7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 17776 bytes
font_02_sfnt_off00014145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14145 16792 bytes
font_03_sfnt_off00015956.bin
fa99d2b3868adb3257d215397e82792edda9ef812aef94bd5c9e94c90c57057a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15956 16672 bytes