Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbde6cd109f30bc6…

MALICIOUS

PDF

91.0 KB Created: 2021-08-05 12:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 966e9115f951447d730dd73ea2169178 SHA-1: 3ad4e781ace6db168c078a3f1a0250f5701fdf56 SHA-256: bbde6cd109f30bc64aa8a6ae847d35cee7f7d778627ec79fe2ce30f9d8896ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04bdc26e9e---35705877967.pdf In PDF document text
    • http://ashioke.com/images/library/File/79362447290.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/71546054531.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb49f3932---7855242530.pdfIn PDF document text
    • http://etre-belle.su/images/file/29801427337.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/q96c8jbkr9oqjkof1b2rb5dv67/51108235535.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67af22d37---34389559205.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/44bjap2fjout27ui6r8pv0ln30/butubaxu.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/gofomig.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dhodsgkt7sk9hlqijfihk0u08s/55482392290.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d50a49d41b7a6ec2389649b87523c119/wukuvixupozemukunapazopun.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wozikatuladewe.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021080404275364.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dagowegomiwagem.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/fagejizodejosow.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/22495528872.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/72521359218.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bazomozonajunarewariw.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lanezodabowonizifar.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/xeloteboraresogolobare.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160906c61d3ac9---84242306304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+books+are+there+in+part+4+dragon+ball+legendsPDF 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_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 17012 bytes
SHA-256: c80d877a9fbf99ac7b337c653770cd36db0b25b1cf7c81a0e3f24fd352ed0e86
font_01_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 11340 bytes
SHA-256: c317c30962cf445664e7822f3c1da186376c77c04dcdd6cdd4c75b5f83d796f5

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