Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2da9b8fd4e3b95…

MALICIOUS

PDF

90.1 KB Created: 2021-06-30 22:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfe22c3f010d2ada638a9cb92628238d SHA-1: eecad7d123b53753022c41ac4967a895d0464ca0 SHA-256: 9c2da9b8fd4e3b958db48fa83aff79373e4382f4bfdd4f55a36324cebbfc3f08
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/77r4cnp6a238f5rrvhsb3d6f3l/zizejudilajoxekibilulowo.pdf
    • http://eksan-ltd.com/userfiles/file/84429091340.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/40412241399.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21ed0873e54031d0321538450ef893cb/totolamisubizozadara.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ffe4ec232765979f7737fdbe9f5c102f/tetinivodiwuv.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bcabfcc8---66798449067.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tk0b7kj2uuojpfn3b4m2jcfh97/kobipuropaviwaw.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa01c0ca59f---46715510934.pdf
    • http://burfel.ru/upfiles/files/tanaj.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1fg795d2v8vjpmbu6smtdgb3f4/finilupumita.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/e8l2nq7e1h5udkake49b0ugck2/tebikukuku.pdf
    • http://sllight.ru/design/img/upload/file/86543849536.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be34e02c1---69261452529.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vqu04167c6v53q6021ccnni2c2/polikejanuwononukuxer.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa913be04---nifebowitila.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6ced2e91183a7947d869cbbdefb692a0/34262241648.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609202bcf34ef---30406562658.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/92432700655.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d53750bd043a06690b4ea3c2eac9390b/xefexudeg.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2fb3e7a3---xuzibefujelegobiruveg.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9324bdc0490076972f7ed588399f0358/kajorajupuf.pdf
    • http://technoculture.cz/admin/upload/file/53313965749.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/48066350bc81fb8c3e0586163b29365a/topuz.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c1af0a0bf0a9be100258399b85b2ce2a/wawipexuroji.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/751d8674c531b99c3df435e835eef482/8451172856.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+start+th10
    • 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_off0000fd50.bin
92aec178095e52d6f52e600b657b452e050ad558d13d7112a3ce3d68f4c6379c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 10084 bytes
font_01_sfnt_off000113f7.bin
78084d36d7475f4ca0263e515620b8a706388b0a7d28575e3efe07702700b5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 17616 bytes
font_02_sfnt_off0001420f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 16792 bytes