Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80752c7a2ed388f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 18:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a953fc614fb3cff5cc840d5756ab9ed0 SHA-1: 47fe6ff59ff2a7e51fbe7f99f2fa4bc0ec4160d7 SHA-256: d80752c7a2ed388f75f0deabbdc52ac32a52e41c967804c81d1fd6c7127954d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5727

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://masini-de-ambalat.ro/images/userfiles/32896062127.pdf In PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/6511384893.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/5273687875.pdfIn PDF document text
    • http://tchid.net/userfiles/file/20279622340.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/df796432e045554cc883ebe30bc1c394/61075349339.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fovapunotenizajegejom.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/1825023324.pdfIn PDF document text
    • http://fluorescent-training.com/file/manutim.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/kobanilavekimetobovekik.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/99504601367.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613913714dfc3---56458623564.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/mojawebigumuzetol.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/rifedi.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/guwepevi.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/sanazexusegez.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/6361571861.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/65018113503.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/5915848607.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/88280955584.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/bagivab.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/fidezeb.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/7807510755.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5da0a7d5c---japamatosewusoxemegoxos.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/pobeta.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/gujifegejiradetabupuxumo.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/vasojeforopu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/37318745743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gun+games+to+play+with+friendsPDF 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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 18032 bytes
SHA-256: 332b95e09071fcf6468debcda8a2f3d3b8a0d2a4e152199770499e4e4f693f42
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 11284 bytes
SHA-256: d7c09026d73c336e125be88e566bc4ecebce69b7b6eeb7ec4ce063a158ce766f