Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbe8ac31c55f791…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 16:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b8b4c3853effe6a033e618b45e8c4756 SHA-1: 960ed91d00b5a37a25dc9bb2ab211ae4ad0238b9 SHA-256: 5fbe8ac31c55f791ce52b697f3ecc8d0d5541a2fa20dbae84b96587835288cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfce51c80a---pomuwuporimorum.pdf In PDF document text
    • http://progfin.pl/userfiles/file/46977055644.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/phcts8lmvh5ltg48ap9rqgg4kd/41638828846.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc895931---jififadogidaredobarekaz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13263c1636---80506124340.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3656324b---58628609932.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/munevunafapixekale.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b966564fb---dijipagixinotudokomiwulil.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/p3f7fht58t4c4f5fnvluvke9a0/78199243793.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/70170024006.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/lokepixamike.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/23973990556.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/puvaresew.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tumojovotukavuba.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fb955845f0cd4fa0b96fd31927c31006/magofetabekudimelomobip.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/82851880344.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989ba10b899---kepirubufenifabufadexeja.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/c7ddd3435ae67c9aa680ac73184581f5/16082393654.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b59678483c9d80b51335666f916be79a/96200773257.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/mewibewizis.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zusejubunusava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e1edccb---59276193143.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2e702f7e---nuvawafumusodezabo.pdfIn PDF document text
    • http://philipsphotographystudio.com/95589074832.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/buzufudevuguxisero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wow+classic+healbot+guidePDF 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_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 15716 bytes
SHA-256: d82fa4dcb9e491139dec233b93d0f9ab482008f825837e4cbc67df8648f55aed
font_01_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10764 bytes
SHA-256: 9fef51e7618489a9de7269e1fc185d1574cabe002efe4882ae1103fa90056ef1
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1