Malicious PDF — malware analysis report

Static analysis result for SHA-256 f061418a33d0d0dc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 17:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c46e76309464dc139f873ff5d8a2f8b2 SHA-1: 89c6b76814c48463df92b5a1b98b5d0bfc472ede SHA-256: f061418a33d0d0dced84f46163bb6f26f0c92e69b3fb8e1e071053c9a69484cf
124 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on various domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=oedipus+the+king+characters+pdf PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360eac2c0ec---sanosakiwe.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/19109249525.pdfIn PDF document text
    • http://cssh.es/img/file/razodoxemig.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/53810968202.pdfIn PDF document text
    • http://scantech3d.com/files/41557026960.pdfIn PDF document text
    • http://floramarble.com/uploads/jamasotepibanijeb.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0bb9546b6792e3d79e956b11ccc18ca1/14164254914.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161331e7533ce4---mitotijosijid.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/18952220385.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/jozosukukulagenevi.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/60490419080.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/zorolufokul.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/dovevozozuluzapixifi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1d9e4a0823dd7ab6298c62a7e5cb8dee/78364900858.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gobogixa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4121198d7---puperopatojoxifekemaw.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/71427496816.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/feliwevijarutez.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/bitof.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jakuwevererevubejizi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/34150908892.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sabakedaxef.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3ff08ba1---85222676074.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210904_0DCF5F3E1C756A1B.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 10952 bytes
SHA-256: 39bf06a710170f25c7909f3564c227624b18c7410a749d6bd9b19247e1d32ceb
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1