Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccfbc7751a694b3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9111ffc1de45de5e04fab0b3e7d7b40 SHA-1: d735f0f2d3b4f2e5cd915fb30ba29dfb5ee4ffab SHA-256: bccfbc7751a694b3e5e75e69fbceffb3e6888fff95d4b62cd924b253be1670f5
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing and trojan threat. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads and link farms, suggesting an attempt to redirect users to malicious content or download further payloads. The use of link farms and compromised WordPress sites indicates a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=panasonic+viera+plasma+instruction+manual PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jfl9bm603lmp2gsplhitlsm860/razizogatovi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/92309268474.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160851e1edab3b---40888741936.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/juzegiwi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160fd402f01337---36749006940.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eeba9c248---rujutebudamimuvef.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c98a8c1c---90417758806.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/96048564507.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95798937003.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101323555adf---besizikivokomozire.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075649bc5997---32867080749.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/388d20dd8a3ebf6ce7e8f404aca7cab9/fedozodele.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/25094627785.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/ginez.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kawugumijaduxodovosipomel.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/wunawejimivulisufisefufa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9e2033fe9---rujuwugokiguto.pdfIn PDF document text
    • https://rafautama.com/uploads/file/navipege.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/28e78b03d9a2728677d1861059654fc3/11269730146.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/ko0cmhlu2qre5aboik0co88p8h/pekemolatojamenememomupi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6300418b---dugabepojabezifoj.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/jumokizi.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 17244 bytes
SHA-256: cc364daf02ea6a9133c94ddb4290caf9a27c2adc745f53895b008445b930d4b3