Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc909b4ea16043…

MALICIOUS

PDF

86.2 KB Created: 2021-08-11 01:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f6420faa22ffc4311dbc93ab0c386de SHA-1: 2d277717f356f9b872cca31362ae198f68998d4e SHA-256: 3ecc909b4ea16043b51925e5c7cfe5eae0f96494e65e63347f2aa32ec738dd34
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=partes+de+un+molino+de+carne+industrial
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1eab54ea5---budexufumilejejimawalud.pdf
    • https://itexpertdog.com/upload/files/73010853437.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671939771e---85362775096.pdf
    • http://doks-films.com/pcms/content/file/libokubofepikapasiri.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aqpah481tak2biuvub49de1r6p/getusodot.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3015bb0982982b4f4fec243cb1460c67/13414558472.pdf
    • https://shibbirs.com/media/files/23587744019.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/letebaturibonanetivori.pdf
    • http://accessiblevehicleservices.com/userfiles/file/13721641133.pdf
    • http://virus-safe-zone.com/ckupload/files/89294826499.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b0b6f492120ec896db1e639b8fd51ba8/87537829070.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35f3a4a6d8e8d2728743840d48e67036/74490803312.pdf
    • http://cnpair.com/userfiles/file/29674465886.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e8e8aa5341cc5e30df51934545421be3/jubamizebikuxozotot.pdf
    • http://niszczeniewaw.pl/userfiles/file/xubewetav.pdf
    • http://kfbi.ru/content/file/91482722122.pdf
    • http://travellerisland.com/files/pekokad.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160903dad18d74---22036854142.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a632116d895a096f8970fdc75d7d5d9a/nagilibexobipazuroxavaz.pdf
    • http://ilkyoukais.com/Images/Media/files/26607685100.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/de96d665038dcd40e96516cd4e2dd974/moreselikemeki.pdf
    • http://www.alfapilates.pl/upload/file/89392916765.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a34bd21f2---bexaxejibotojufanolo.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7059cd795bc28c1a9d12f770b18d9276/senepexolipure.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7f48d2fe83be4436c8e348cc50f072c/vozewozemesidotovufepu.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_off0000ec2c.bin
7e5e7fe9c666911b3dee1cf2e354affec0817e07b71deba79b9c066246d74f13
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 10632 bytes
font_01_sfnt_off0001047b.bin
8f244469dbea1a21f21ec86d3e1e8850d52f1ee1a2c8d82172f3243766ee1669
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 17844 bytes
font_02_sfnt_off0001321e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16792 bytes