Malicious PDF — malware analysis report

Static analysis result for SHA-256 8987a4ff803584b8…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 17:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c36feea30984c08f1de795a26680416f SHA-1: b693f009b9bfbc4bef5bfecbdb7e0970393c02ca SHA-256: 8987a4ff803584b8b61f0f005613620d84df3e66c5d62d64f79918fef73ff007
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/52631567162.pdf
    • http://homelife-superstars.com/image/files/xazoxurab.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/20160262617.pdf
    • https://sambelteri.com/contents//files/49635080776.pdf
    • https://arhometutor.com/userfiles/file/39678976873.pdf
    • http://alnadaoil.com/userfiles/file/patodufuvefopudajinuwube.pdf
    • https://arhometutor.com/userfiles/file/fixotoladudexikudadexokaz.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092809890f02---95028891629.pdf
    • https://bselink.com/userfiles/file/23332233012.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad002d17fc3---miledofelef.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/49889565726.pdf
    • http://poorclarescork.ie/images/60562872966.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bvovkp2l86v52flhkcqqfq40d2/fobawedudatunamoxudi.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/6015f5941d1dc3a8537702df39d29efa/64570977934.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fe9cb5c64024e6005b95954b820a2b23/5467920501.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd34c82177---77119974864.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a64471d22---bopizurawenijabajagafiv.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a0960278---30752907649.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5018689c02---96590674147.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a6e7d84b1a7cb20b0fe017831ce0a962/vupukodevujuvuzidugojof.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc9ec2ce---sonomereka.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/149dfd9d055acfb3f6eaf113534abc95/41492451892.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c44ef7059bf65aa96bf55d001846f2a/24134063670.pdf
    • http://angeladaniel.eu/uploads/files/21092563935.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=roof+lines+and+additions
    • 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_off0000e7f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
font_01_sfnt_off0001000a.bin
088a82ce7ad57df3076a7a76f6763b9cea0f74d796989167933a08b768952b49
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16540 bytes
font_02_sfnt_off00012a9c.bin
9619059f41d2eff7fe482a3e3abec51b197a11337e425af4f0da714c27230dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 10292 bytes