Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9707cab0d14191c…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 20:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de07da10dfd422808bec2e2bc4cd6b2c SHA-1: 3dda75d41107a719e992c6f58e99a09f4e8780e8 SHA-256: c9707cab0d14191c88edcfad8deb436d1255ada61234e8949b4e3179b1803cf6
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings clearly identify the link farm and compromised CMS upload pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c888d8a1c08---64476927167.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bc09ee86---wolukapuvubanefudavir.pdf
    • https://africanresearchcenter.com/userfiles/file/52443320664.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a70bd0dbd---32670300382.pdf
    • http://www.kickcommerce.com/userfiles/file/wupesapijupurif.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aace397e359---gowep.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c1c83624e6629c2b4a075237ccbdce1/59931111873.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/af56629c425cdf45d276adee4f148a5d/lasopumogegoperoba.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ugco8o9u5l0aur0dn6p9argp54/62558950952.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ee25b93ecc193f9e7ad98dc84578de12/lidod.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/11551371419.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ou4u1scsmkn8p4skmf0v9dhqkb/xaxukagenuzemivupobuvu.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/aoasor8ss13qkclkuamq6h5uia/27646332662.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf9d37ffc---nugimajopuf.pdf
    • http://caf-ljubljana.si/docs/wiruwunediviwu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ac0101d6---50639883322.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0420414f---95971659185.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dd57547a0---37314207140.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d4dc9ed8---zawutanarakuta.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/97249233891.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1056df89---judomaxivububuxezelan.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hhqam08qu9plbvml9up6e9nmmv/kivepudilisin.pdf
    • https://aldurra.ly/images-editeur/img/file/43891558027.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+beast+of+the+southern+wild
    • 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_off0000f0b1.bin
402a6653befeb159960b38c3a04f2828be149d61985ba6dfe404218729bc9e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 19288 bytes
font_01_sfnt_off0001220c.bin
33bd47ca28a98c7c3df46909a25d30a346657f15d060117c04d22134816e8bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 10740 bytes
font_02_sfnt_off00013abc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 16792 bytes

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