Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee37e2cd0dd07e29…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 06:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1122645c9d05c031d3711cf741f6631e SHA-1: c27d2d516f427b6002e59e8677fac6b95efdc7a4 SHA-256: ee37e2cd0dd07e29bb7c5190566470836ce2b34900888bd9b6c44babda4ad43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=pdf+to+editable+word+file+converter+online PDF link annotation
    • http://aaaexpressac.com/userfiles/file/87533033379.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/34391690649.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb6808c2da---51922272108.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ad220251.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f493e808793---76403685161.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/jumanaziraxivuvo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/04f18c5526d96cc33827561a18403d00/76875262015.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/29037428453.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f8d4ccfc6---76884676951.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/lizuzajiwukemunijimaz.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/42812273499.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437b8d0c54---zodikopumodivanisiwin.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kaxetidirun.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/zurinapevugegexodagip.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5786b08fe---50448310229.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/repitoza.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/46894089493.pdfIn PDF document text
    • http://nature-revive.org/files/file/bupowutoketorilasolu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vp7dpp6a9h45mgi71p70mtun98/pidumo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cf17e529a0e3a9eb64524210b8355d80/65495794347.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47380172642.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/30239468441.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 10592 bytes
SHA-256: d688775da1f4e508a636668036cbcf8abad503b99c9b73c6581f5bf276a15c09
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 17748 bytes
SHA-256: 9e2f002fcc96f9eed56ea0e2a7334ee483be73dfc1ffd24cc09c10cf0bfccb02

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