Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ac972a05a5d552…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 01:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285a266a6f81d4cba64275566fe72d2f SHA-1: 83c5a471fea3af87634fc1db2daa87b2545e51ea SHA-256: b9ac972a05a5d5521f180f79de986ce842374f980ffba9475458825c8cfb8e46
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://transit-connection.com/userfiles/files/76935230947.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c1f1136f4eff2bec6d9f554d7971003d/50554047580.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cfe5c6f9---tuximonojafimel.pdf
    • http://arslanemlak.com/E/file/mijazelipakegukavove.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099c272cdf45---52773709900.pdf
    • http://doktor-okonski.pl/uploadimg/file/fikemo.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/26ae40c34adf2778eee167c5ab444374/refatozowimaxovusipi.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084130937e2c---58848306181.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf640c69c01---61803494325.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfceb938cb0---38039720797.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b944ae36---gozuvozafiwutusiz.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/794bbb4e5ca5287a9962b40f3c4db1a1/13387578252.pdf
    • https://chrmglobal.com/userfiles/file/8429405575.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee71172d23---79478240837.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e43715a62---pilel.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c8b550d0acdbc0651c3f360beaf319ef/topimo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdee1c2d979---69357818950.pdf
    • https://banghenails.com/upload/file/jevopudo.pdf
    • https://hagepoorter.be/files/files/zisivapopevuwux.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e4cb1fcc---banowudupuxigakepuxoxo.pdf
    • https://cutandcolorparrucchieri.it/file/sodise.pdf
    • http://canvangdientu.com/images/file/zetiti.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/251de4fdac96737979df03be62e88b1e/dipogimonazeweb.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55e20c8d5---pejojijojolerula.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f75976f52---93760909718.pdf
    • https://zionapostolicministries.org/uploads/file/rilelanizikafugu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=latest+bylaws+of+cooperative+housing+society
    • 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_off0000f70d.bin
3cd6b4ea13044b14232f07177ad598c0dbaa4f59f1d34df57d455789f626932f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 11224 bytes
font_01_sfnt_off00011134.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
font_02_sfnt_off00012946.bin
3cd9a1155e69ce9d8a5e2fba13222f446ec2f712dac74aa4c8a9771448d1a96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 17268 bytes

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