Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0dc82c9b75dcc7…

MALICIOUS

PDF

89.9 KB Created: 2021-08-27 20:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf80d3e482a385e3a4eb255966a92236 SHA-1: c6e959978ab600a6f107d8676b545f76e8579d05 SHA-256: 2d0dc82c9b75dcc73838a375c0f7a523699dece522d7fda764bc2da5b212e8a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8e86651e3a275a99b0184b644f4dfb5d/82215232558.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716e4392d1---biwiposamu.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/87145014009.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/96464169399.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edee9f829---60472662376.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/dasepedax.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/30050489382.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092f8e114555---34080697467.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/23809530574.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/gimurikitisuxu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/67637031814.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee370c30039---finogowosilalugirefag.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c9b380c4e---96166932831.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c95955db9---26147699796.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/92792817044.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/31379070497.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607546745ed62---30269581688.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/fawoz.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/levaputekadedamewosuxunu.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/jaxuwajateted.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c578729b559---99132818480.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8be04bb7ac3debec20b96183dbd7ceac/35243056477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=romeo+and+juliet+prologue+activity+answersPDF 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_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 17524 bytes
SHA-256: 32f5611632c1901548fad5e29d6214d37ed17f984d4da5a486d3f23d2bfdae7c
font_01_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA7 11400 bytes
SHA-256: 12c01c64535fa59d95d7b41af2811ff9e4b330c6a5f5879f9635f76fe141a8c8

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