Malicious PDF — malware analysis report

Static analysis result for SHA-256 983c04175cd8bdb1…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 20:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c480757f434bc68f46e64191532d2f5a SHA-1: c3a8fc0d56bb6755edf76137cce3489e1cbdbb45 SHA-256: 983c04175cd8bdb1e56d77dc4e2b15e183c826a0cb951c6f174f050b85ceda59
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. Numerous external URLs were extracted, suggesting the PDF acts as a lure to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the idea that these links are part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=messenger+screen+overlay PDF link annotation
    • https://damiel.eu/userfiles/file/rululikedu.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/7653931987.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/38338204635.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/gogilifikatijelekibunone.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/89921722513.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1cb6053b---dewowuzapiwanubo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f4ee7d851ca1dadec20e287319d26b5c/93307099368.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902040056.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b569732a6---13016809825.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/vitaforobinawupuxug.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/28329945240.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f226d501df---47757452819.pdfIn PDF document text
    • http://www.puhito.hu/uploads/mibivep.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/pevotudexiloka.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/xuvoviwavapakinezu.pdfIn PDF document text
    • http://zerosquareonline.com/file/55859723803.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87270795935.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/20619895209.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd2c57c00---82780314698.pdfIn PDF document text
    • https://themalc.org/files/file/30415897992.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/maduloveferuju.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c790cb2674ccd322e019f79e2a7a7ac2/42015202764.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614211ee890ae---wejame.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/simagevexojojiteme.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 18460 bytes
SHA-256: 647d0e1b673a219756eba989be9c0bfd61f78eccb48da3e6789d9b8dbb135012
font_01_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 10388 bytes
SHA-256: 54332939ee39e910c3402704b47776ebec54a7fa9ebb6b63f45d448888b6cd8e

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