Malicious PDF — malware analysis report

Static analysis result for SHA-256 5977d10b85a00345…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 12:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7546a47accc64ac9d8bd33849727230f SHA-1: 7e880a945f5a37b1887fd65ca3b37907520d6fa6 SHA-256: 5977d10b85a00345bc6c4e71d6c836e92771f19a8819c9a42c4fbdae7cbcbd82
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious sites. The document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7307

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://artgallery.devctn.com/ckfinder/userfiles/files/59366476975.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa9731c58---91866653059.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/86002500057.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/dijifeburobuwogepanukoti.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomuwifufafuzige.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/litidilizakufu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/niwewi.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/gakimusuwob.pdfIn PDF document text
    • http://gro-felix.si/uploads/1469645362.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/wejefaximujesikugito.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/12261774645.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7715829a890299dde564950e03592e6e/motewubitidip.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pokuvodujezasibubuz.pdfIn PDF document text
    • http://yanartextil.com/firma/files/lapafepabodojuvilixiroxop.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/gideni.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/remigugidaromeduw.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/14180450896.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/31115345758.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/jesipugog.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/41692252228.pdfIn PDF document text
    • https://fasleh.net/Files/files/63926808614.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=transport+refrigerator+on+sidePDF link annotation
    • 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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 10588 bytes
SHA-256: a863ee1eec316991fc4c45be5d666522dcd08a5de775846a10306c2cde046d0b

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