Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b02093e86ca31fc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 19:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe1be107a7e206df4b93a12e46d6fc66 SHA-1: 67f6894a6353267cfaff84f0076d4b6c31139f75 SHA-256: 5b02093e86ca31fca12d93e542a6a4de0e3a49796fab90f17977b4544343ae69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf005035a---3881513620.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/38946842122.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/sipikofimuruxip.pdf
    • https://adamant54.ru/userfiles/files/94209730527.pdf
    • http://speckrepej.com/upload/file/35831621672.pdf
    • http://tryinvest.eu/userfiles/files/tawan.pdf
    • https://lhorizon.ca/uploadHorizon/file/bopiboluz.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/39575395080.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb37afe3c---ravukex.pdf
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/53741683548.pdf
    • https://biodez.lt/i/File/74424038604.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a5a68c6---12855403717.pdf
    • http://fygl.net/uploads/file/040412585408.pdf
    • http://apartmany.cucoriedka.sk/data/files/71115707425.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba436309be---58481785976.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143282960986---vomevokevijig.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/tubalogozivixenarow.pdf
    • https://efficimm.fr/userfiles/files/47332843807.pdf
    • https://nyirfa.hu/uploads/files/zimitaw.pdf
    • http://pnmanagementsolutions.in/uploads/98316660598.pdf
    • http://studiospazioambiente.it/userfiles/files/likejezaludomuxod.pdf
    • http://abworder.com/uploads/files/84996237246.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613612f46155f---zinuzotijusen.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/dawizesib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kissing+booth+2+full+movie+free+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da17.bin
a6cbaa2dbafd36389358b8c15977a5b6f27c82627ab3fa36020f26a885401e21
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 17472 bytes
font_01_sfnt_off000107df.bin
4a5b6ce5905fa20dfb653742d07556120f6fb07503486c4615d4407d28b336a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 11288 bytes
font_02_sfnt_off0001224e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes