Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f60d242e027d1…

MALICIOUS

PDF

79.4 KB Created: 2021-06-25 15:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d663b77730b08dd5ea6d09596bd4aa4e SHA-1: 95f9bef8008687d37b26a388bdb7fb0d4aa24977 SHA-256: 3c3f60d242e027d14d019a22c8841cae307657cd2a4b644cccecae8309fb9b4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609855fa2fd2b---14766836222.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc01982589---83626901309.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4dc9cf686---2252508310.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb06904808---vusiwozagizapenisemexu.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0768si4v5ht02s0l5rvdrlfs5a/rasumamamiwemibujilopena.pdf
    • http://doktor-okonski.pl/uploadimg/file/39182533615.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160899d6a907cf---33255022864.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a1ae3bebf5fc601ad1b27687eb68bd4f/55145626408.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2181acf5---87265855262.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa2fbf8f4---folubefowepudewajoverogo.pdf
    • http://majorpropertygroup.com/userfiles/files/82540239604.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8260aec45---lemomegiremutevubexujibi.pdf
    • http://latexindia.com/userfiles/file/26887542956.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c6d9f5cf---jegibexitira.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e9531aae9af6fcc87c845a73c742611f/gifabusovapitukudot.pdf
    • http://soles2walk.cz/data/file/getorivakijudov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=example+of+deed+of+sale+of+land
    • 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_off0000d699.bin
b63fd4d66d09adab184ecfd5a1268c6634909fd1c44c1fbc6fa2666bc41e3755
pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16412 bytes
font_01_sfnt_off0001010c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 16792 bytes
font_02_sfnt_off00011923.bin
95cd2d6d57299a22cb8931b50bf6a55beeefc7d3c1e71afa85fa3f1bb53cd282
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 10456 bytes