Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79d8e648902210d…

MALICIOUS

PDF

97.9 KB Created: 2021-08-06 10:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ce9f01c43810423ad56f43fb0d1eefc SHA-1: 5b440462dd131e9bf3f864809b2a1a4ebb39be15 SHA-256: e79d8e648902210d4efbd7fd6a77ed9ca71586a228fa2196b142f03337549999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0o6q1iah4su9s8ni7pj1ru8lbd/riboxixosu.pdf In PDF document text
    • http://24cvety.ru/upload/files/nikekalo.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/ximosefuzifepadali.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/27260046777.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/74844483567.pdfIn PDF document text
    • http://byecook.com/ckupload/files/febowofavafanolijeparuwa.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/15546772529.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sovusoxalavexegutub.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160885d7a9e452---32065908157.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/sinomafari.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/52562379898.pdfIn PDF document text
    • http://lapiadinafelice.it/file/39032394256.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffbd48e1d---90784110595.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805928115a4---33875953530.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/99342529842.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/memuv.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72d49ba731---lerifobulororerapiv.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/15033871220.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcdf53dcd9---rukukazesusumunepozojepes.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/26900125754.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/21756326059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chaos+space+marines+codex+8th+edition+pdf+download+vkPDF link annotation
    • 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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 11468 bytes
SHA-256: b00ee4fcfe133b7fda8ef9764e8aa1f93e48e17bb48cac8bbf440c61ec399628
font_02_sfnt_off00014c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 17468 bytes
SHA-256: e041926b1a36ba39572cabf7282d8e347f5b03ba3987ad9a0e47edd50c63d69e

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