Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b11e7894067c21…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 13:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e21cf5e158d3c9fa6fe64f51ff3f4a6 SHA-1: a259126a472c0075cc2949c894ea93aa4bd6c07c SHA-256: 28b11e7894067c21c6369828cc9496174884f3fae167136f8ca69813c8d1ab08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://liburnia.pl/userfiles/file/93536078409.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/256c1ff2a040d9ea5eee58e6928b1a1f/94389568587.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/gomugebivalujumobefo.pdf
    • http://saovietgroup.com/upload/FCK/file/judizirujojagemimuz.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf981d56a7---9071372685.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/bowemamovulabe.pdf
    • http://archerelectricsupply.com/userfiles/file/rezogufobobepugum.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3b7f152b9ae39e166c98ea20bb545594/97479558854.pdf
    • http://orchid-daikanyama.com/userfiles/file/jarav.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/02cf63664b9e28f66f58c476fb777eb7/51996766317.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082585e546c8---79797382091.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ae534b9b---sogijife.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef30f1dbe---5132038156.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4704ccce8e---bamuperigimuka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=10+and+under+tennis
    • 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_off0000eaf9.bin
ce3ce2311e07eaadcc90a28584ca95aefd8b711e62dec7ed7f536acc9d961859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 17992 bytes
font_01_sfnt_off000119db.bin
d5253f2bb3581c2496fd1f13de15af2ccdbbc3f04a936487dd2869e4174caad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 10252 bytes
font_02_sfnt_off0001310c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes

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