Malicious PDF — malware analysis report

Static analysis result for SHA-256 d131b690c0760a40…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 15:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25d7d42d4204204c9324dc3bfdc69c0c SHA-1: fc85e0d963861964b6a2a88710548481c7a57110 SHA-256: d131b690c0760a408c8ba5938c688b96bcd1192f9e63da4a10ffc10a6db74426
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting the document is designed to redirect users to potentially malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b257a7da03---56962992237.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d5a76da2b8c8576e6f74b0bf95cc3db4/94198268102.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bf9fab8413e6422adf906bdf00f8fc4c/gotinakufimo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde8eb2533---7239547845.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3744c67d1d272249c413aa78388bfab8/vufuropuxozurexojonomud.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vv91ifu7kbjo5viqd2q63s5oo6/69606434508.pdf
    • http://grandrosso.com/js/upload/files/11157362891.pdf
    • https://www.mds-horizons.com/upload/files/59262321487.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdee958c34---pebofenurumapameg.pdf
    • http://xboxheerlen.nl/userfiles/file/zojovim.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c707f0caa---jelal.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/37985750073.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30ea950df---wedolokajetopimivaxurireg.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q9mrroukdfpf411hr0tiv5va5l/gedofexutiso.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f8c52833a8d4529d1612c0497be29eb8/3419663424.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2bb559a6a64bac47661b3493d14764ff/95476290137.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f52d0c71---97972573130.pdf
    • http://absigorta.com/E/file/55158778612.pdf
    • https://palezieux.com/ckfinder/userfiles/files/sejedekidifamutoki.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e50497e8a6f51e8ba97479439ee05aec/60887144286.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gj8ianeq018kkltd7eaa1tfe1n/gamigobigonujeze.pdf
    • http://banhangcongnghe.com/upload/FCK/file/xekejopo.pdf
    • http://automotiveenergy.cz/userfiles/file/36732646397.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/dbf13b72f6bd111fc807f740dd750c86/62893217317.pdf
    • http://www.ecvbrass.ch/user/web/file/jifevowi.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160908523b8e92---73627330812.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2ea368bf90371a6a20afc6ed953941e8/27987576425.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shared+equity+remortgage
    • 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_off00010ac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
font_01_sfnt_off000122da.bin
ed41afd346427ca13f7036ddc757e7c33797c35b7a63a43be3f09bcd3be0bdc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 10812 bytes
font_02_sfnt_off00013b54.bin
b45bfcf21fb4aaf95257c35747571751eb5ac999348f5f3c10c90b111c874af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B54 17140 bytes

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