Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7d2b9c9e7ca225…

MALICIOUS

PDF

83.2 KB Created: 2021-08-03 23:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e5ce51f42ff60f67b32d6c0ad89cb80 SHA-1: 98d5de5de1bd8a5d25142161e2564c710c45a9a4 SHA-256: 0b7d2b9c9e7ca225ff34e6bcefe3bc8018559288f369c579b99a2b4a55caaeea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs likely serve as lures or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609846c250bd2---zupozubosu.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd26da0a0f2---wivusurivuka.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/13495565109.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ab50cd50fc8e8320da899b84ad718b37/93786897860.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/pulerimujuraramipedojut.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16252664141514101839.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff5726be6---76837662619.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/91855667026.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/50478988229.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2df772553---butozegejewigazi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/48389801709.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e375355fc---jexumejurefosi.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/sesoxasexit.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/borilagadafixawuzupa.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/zegatodumesurerekofip.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4b283168---tetowevoki.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/53991621489.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0007b1785bde755cdb22488042bcef7/55548913374.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108a9ae15bd6---21669939259.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/29676219314.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/rufesodolukiwob.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6ed971709e8e38bf8814ceb48577cd4f/7599597568.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a2d63ce0---87507379094.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/72901403495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=windows+xp+error+sound+remix+downloadPDF 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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10736 bytes
SHA-256: ad13df849abb4f41f07506158aa8df3dd2b4a5b08ed26c70871da62b8f38afdc
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17728 bytes
SHA-256: d52196d1d7dbf8fa8f28cde582d092f296d6cc89cc9229c82b5f8876450bb668
font_02_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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