Malicious PDF — malware analysis report

Static analysis result for SHA-256 040f31cef852544f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 03:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50a0be2d7db7c5a46108b7c5bdca7df8 SHA-1: 66abbc9caf4f58a0e05cf9dbd5284f52b0607d4e SHA-256: 040f31cef852544f197d5768ae8aadead0510eb5dd1fd5194e29732220bf768e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5dde353257eccf64309caf80bd523fdc/43118408645.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a920c81---15399791016.pdf
    • http://goteneplast.se/files/images/file/74219999098.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/04dbf818f81c0e33cbff33e561a6b609/wupajuvojoduwuzedo.pdf
    • http://malbreil.com/userfiles/file/toxuzutowikojaziwad.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b22c5121e2808b57db1bab6290555e4d/40057984433.pdf
    • http://sunarfactory.com/userfiles/files/6399821999.pdf
    • http://verkaufs-akademie.com/userfiles/file/duxozozudufokusuf.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce6bc10ccc---45692904867.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/12156372951.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749f837aacd---52630947485.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/51433818120.pdf
    • https://drsaman.com/files/xivowitiru.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a8f1e826dfa527f086e7aad9f8c5b230/12162056385.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7758749---zurezuguzabiluparuxip.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5281f186077a6435161262fae321db4d/9519588293.pdf
    • http://finproekt-msk.ru/userfiles/file/22142085861.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ki83st705fboq3avse4e9lkd6t/fuzokit.pdf
    • http://cpgny.com/userfiles/files/fatefuboxofazipepivufu.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0564b8e33---wivitukinubilowukulup.pdf
    • https://ntwbearing.com/UserFiles/File/jumubipagolalalamina.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d1f167bf018d177d726860cc870d2ea8/juguzidoma.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/920f7ded58202fe0312267bffbdc5f7d/14648003928.pdf
    • https://fedico.ca/upload/editor/file/sajutokotoruluguwolevim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=house+of+wax+2
    • 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_off0000f2ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 16792 bytes
font_01_sfnt_off00010b01.bin
58faf0dadaab258e5ca4d9e0c0fccce3e621bf6efc0ce42f8dfa9f67f4166528
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16844 bytes
font_02_sfnt_off000136c0.bin
649846bae782d763be131751a4400f0eb5859bca10d0a0dbf51590a186d930d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 10168 bytes