Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d368bf3965f6b3…

MALICIOUS

PDF

57.4 KB Created: 2021-07-04 01:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c7debb0262e723efd991526e2763c47 SHA-1: 680bf9c54946f51de8301d9608a785f8717e4ded SHA-256: 31d368bf3965f6b38e8a0289658f026f36d1cd0dd8b6df532187e08a8637dfc5
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites, suggest a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=neat+diagram+of+digestive+system PDF link annotation
    • https://cncostruzioni.com/userfiles/file/5218984674.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc9ec2ce---sonomereka.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bij680g6c7h67hpqhjl6bb1b75/92184103567.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1983b960---58515673026.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160768478c45e9---liroxawamezuse.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/12000939588.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1010975a2---xibeketapukoje.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pifofumezuxijemulab.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rigekapexuxi.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/4024926676.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/34a45720eeaa2f860940b355a9fb30a1/jaxirazobozasorugijunuri.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160731b3ab686f---53708679238.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a5efat8jo7r4uolajgkobt55m6/pakaserijijatobuwolebexot.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/53549386347.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/lunuxixejobogunaliro.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33baf05a7---26832847441.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608375aee4683---14809827653.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/52173497596.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f6b41e09---83045516004.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/qiqmdmgj61a9jl7o398tbhi3j5/76514531563.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/pikiwuvomamonigubumad.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 10704 bytes
SHA-256: 21d708f91fd312953368f8afad570849550189debe358af6c90394d347dd0502

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