Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7266f6a116fd4b3…

MALICIOUS

PDF

90.4 KB Created: 2021-08-06 03:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a30778f71a15c2ce4fe044f779a0acd8 SHA-1: 574852754afec349206a37e6b68bc2127abac509 SHA-256: f7266f6a116fd4b36c5f00326adb6a6028f150c8f0ce7512a2156856ce50c7c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b7000b90d---95559538003.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce6ff2fda---55808062987.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/41053190462.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/pitidufoz.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/siwonekipefeturozuvo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sakenazeru.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/52652050647.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/776a47ad9b32a9125c495c7aa6261196/64834476332.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f80f37d46d0---38272450724.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mr777q5dem4h8ijn12javoofh2/69092246369.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bbc7a8ec---niwufasubuxewijonosazaw.pdfIn PDF document text
    • http://1carl.com/userfiles/file/66200375792.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/38937110934.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/pajovodilasu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lpacepj2qgt9tuogpk1sbroob6/losadupagobawodopiw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bda20b4e8---7542841669.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/01cdffc0e3d0c4f3898d280599f189ef/xubazetidimid.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce1f7a90ad2e40af84989769880844b9/83757367767.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/46259136568.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jamisojakadi.pdfIn PDF document text
    • http://altus.pl/userfiles/file/52497409676.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f097f486---67672508803.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gobik.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/3154701297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+android+data+recovery+software+without+rootPDF link annotation
    • 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_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 18548 bytes
SHA-256: 713a5dcdb83c8926f726815ae5af238cea03735978a3dcf9c68749d53cb1198f
font_02_sfnt_off00014b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B59 10944 bytes
SHA-256: d529ed2a920aa3d10b75bbbfc8871769a6a1fe36f4ee92e8319c3d793f6ce344

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