Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c0a263dc7cf292…

MALICIOUS

PDF

81.5 KB Created: 2021-08-17 17:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca6c89adddcaba1daaaed051674a2db8 SHA-1: cd605381f4397f1fb07afc11c521883d31e2e392 SHA-256: 44c0a263dc7cf2920d3690f870d5ad7a49e30c25b46cfc9bc58dd8cfa7cf07c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=evolution+making+sense+of+life PDF link annotation
    • https://anandamsanyal.com/userfiles/file/52313321345.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075969c371ce---84834049577.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/ritivojavarakadosoneluk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6367ce79bd---71161113416.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jifafivafafive.pdfIn PDF document text
    • http://hkwwta.org/userfiles/lelosigino.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/15294824019.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ed72ef6885856f42ec5940d48d17d16c/81155375401.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc1e87506063d0a3c8041f8e4551160d/lofefume.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/guvivejuwekizap.pdfIn PDF document text
    • http://metapolar.hu/tmp/11730542183.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/vikerozakogo.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/6715039551.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5a8a9905---89175650511.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/firagazugoz.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/373da207690fe48a33394d41f1e6169c/38524616847.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/405982e88d6744972fbeb969280408d2/39621244749.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/43741719099.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/98013799131.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/xewodutafomi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7dc4541e7---29639132243.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73356e4fb---lumowuxafinosuw.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1f5a5008fd70714495438e939cc7e19b/jatupagoxajovakese.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10696 bytes
SHA-256: 6504e920c5a518c3106184708636d74689394411458bc2f6c41e4e24159d7cd9
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 17128 bytes
SHA-256: 38f002bb907ba9f92ea05d4036ddc7697dc97bd310a1dd689964822469030869

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