Malicious PDF — malware analysis report

Static analysis result for SHA-256 439e2003f566453b…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 02:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6728cc7f1a5d6d12c386a297a393a716 SHA-1: c21c66bfa01c32aa72d1452a02069734841f2564 SHA-256: 439e2003f566453be176c898dc568fbfb8f3bf01640156aa33749f3cc63a4d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that this PDF is used to distribute or redirect to malicious content. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

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 https://inwebjor.ru/uplcv?utm_term=feral+goats+for+sale
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/80e37397a4b5c59f5de537b6da6679d2/gajetukitim.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cbe73263---40029889262.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6fe92653777c37490ee90b7f16e2f5bf/tobuxukazijibos.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4dfa910b6151004bf493dd384d8f271c/24397107107.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bf3c0b3---56799373940.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qqb189o44aa5jbq8nsijom7301/25802669493.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f08a3f585---lemebokedid.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/839ec10298cdf2b832d233725c9d0e22/6713225262.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/16840801272.pdf
    • https://superpart.com/files/25461916085.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946641284a3---zukuzazanurefoledo.pdf
    • http://kapli74.ru/upload_picture/74625286939.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3789fiqs2v6g9p9cmkd6hfekon/pisuzufezad.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f102d69aa9---zakabidamovoge.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b35d5f5f---93694387274.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c5c2935cc456699e8199ae5be2189b57/subapobofinuxeroniketox.pdf
    • http://bscartridge.com/pic/66919152840.pdf
    • https://organicfertilizerproduction.com/d/files/miwevisijadokozesoboba.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/70bcc600b2f0d05279ed6146fc970537/97593055700.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/naseno.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608407841d234---fenesevenagabakofo.pdf
    • https://triangle-electronics.com/assets/userfiles/file/41401959084.pdf
    • 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_off0000ef9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 16792 bytes
font_01_sfnt_off000107ad.bin
30f14cc7d5b8b2d2c0f965f88cbb85fb9bd7b2ba29b8623872915ffd602d0991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 17264 bytes
font_02_sfnt_off000134b9.bin
f84ac39435e38b35e1ce17fc2f1ae51219b3efa3f9634b1a594565ac5c93582e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 10172 bytes

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