Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9cd7f2c02825b7…

MALICIOUS

PDF

82.2 KB Created: 2021-07-08 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e9443dc6fc8998f1e8f29543dcbe461 SHA-1: 1bc21650a75ced53c69ada9a5c6c02e5c9f7c6b1 SHA-256: fc9cd7f2c02825b7b8d9c9372769945f7b4deef1537ddde82fca140bdbf13e2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845c5e18385---lodogorarijuvodok.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fmeqihv0m2n8ouuelkif8pm5n/wapogiwusaxa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5f721fc6ed15de261eee3bee9cdd50f6/gubig.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/21354627230.pdfIn PDF document text
    • http://immopolignano.lu/images/gagiwogisinunigilap.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/60433368438.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kazilixijuxojalenamomane.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67805f8f1---tubejelowolelaketux.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/58484820793.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2ea3070b56c1b357974a90b582f70436/80039341609.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c8d8af---boxagabenobapiberitas.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/rlime0tr43gopkq785h0so6ig0/23349287441.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/38ff2d680e7c81faad8c6d4bd2c8e62a/47068574429.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/du1b944j78ruvdqb4e9fo4d94r/fodetajetoperikawovafo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160805b55ce99f---82592192138.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/7029076959.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cvtics8vkkkf823ft3iquq14q5/veziz.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davakuzidemezamarubi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070928f39b33---soguzo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/barotodewupajobigiga.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c366e2da6bcaaec4f18d4995d3351178/22917977628.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/wowonepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+an+even+functionPDF 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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10396 bytes
SHA-256: 8e3c1d0b91277ba614a7b84c01d1e0657f4452617677e134bb2cc7d26f6efaf4
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16080 bytes
SHA-256: eaad88b3535daec5ebfbd69ebb426e2e19b889ae367c9c38cdfe154c94332da1
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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