Malicious PDF — malware analysis report

Static analysis result for SHA-256 9403b228e6598d76…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 22:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb73ef8414d52944a11c7723b4d2f91 SHA-1: 0199a371c2911e8137a7455e29908fe62a6c9183 SHA-256: 9403b228e6598d7656e0f17c922c7dd1205867a9de2960a88d7ea97838fe8bca
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 websites utilizing CMS upload functionalities, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cocoal.com/uploads/file/65880767736.pdf
    • http://studiosaletta.it/userfiles/files/92669123379.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b7814f4dbccdbb9a8abadde9b5f6653d/bimasavagerajofok.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c41d932cb---32516809813.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace02aad92---xuranejakuzi.pdf
    • https://xlspandoek.nl/userfiles/file/relore.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1c2dabaa---85849010162.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/rizowukavimanup.pdf
    • http://vds-construct.pl/userfiles/file/wavezipotip.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c583e7265bb206acbc74617b1b9d789/nulasezilef.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/55375c39b7433e56b66bafefc9b4b3dc/37974662625.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69a424996b5c00cd05082d3618495913/47633680159.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/86e82a167f5be47cf7f0597b786cef49/bujipuve.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4eeec1272c68582f23807d6c2cb2a171/36751297673.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d814104962b08e6b4f5549b3ada13350/xupavosisibusumowil.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23df669ecd---sipudozolewaromoxokoku.pdf
    • http://www.anjhimayath.com/upload/file/29403227252.pdf
    • http://asea-admin.com/_userfiles/file/20210618031155.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5427010ef---70996353540.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/7123638701.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4c918c2f---11793116582.pdf
    • https://tecnicadovolante.com/images/file/xedafiporalubezuxisebedu.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cuoqd9mco8qrkcedl1fpmc2jo6/vamebitofoxexeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=european+federation+for+intercultural+learning
    • 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_off0000d8b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
font_01_sfnt_off0000f0ca.bin
f7b5fac87658ba2bbeea2726e8a1cfa104533aef89cf25e3daf8b9ade1806c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 18220 bytes
font_02_sfnt_off00011f2e.bin
77f87f3b82d6fbd312567e5cae5b3a76570e9a5d8359cecd13f0274475114da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 10708 bytes