Malicious PDF — malware analysis report

Static analysis result for SHA-256 165bc641b308ed0e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 20:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c343ecf8795647b25e61d4a1a4de5c3f SHA-1: 454f6d50c304df8bd566179bcc70d4da5f5791d6 SHA-256: 165bc641b308ed0e0eddcb164be11c4db7b8cc259caa292cb0fe78fbe888ab60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the final destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=adjective+to+describe+personality+worksheet PDF link annotation
    • http://parkergeneralcontractors.net/userfiles/file/77580982533.pdfIn PDF document text
    • http://fxlcd.com/upload/file/26847982933.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/feforosejulab.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd113fb55---vixasetofatutotamabu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/nesaw.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/texipagireto.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/tenojalurokegalagerunodi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f300d4379763db102359aa38113eb23/wefugizaz.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/66150068174.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/betisuwumopek.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/097c44fa161bd219835d7ff5fcf2b757/jalavu.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/57809117843.pdfIn PDF document text
    • https://ismart99.net/upload/files/21258180216.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/tozanom.pdfIn PDF document text
    • http://focostrade.com/files/20210701161316.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/79907120095.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rilimezevegamodo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210612060339.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/95438908305.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/25cebe805390600d3db692a0a8eb32c9/peseputebibijekoremesa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7ac96dcb6---53099047375.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/30421323764.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/viputewosumipabixamel.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nulifawap.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee6a72e12e8c01a5e930073ba325faf8/paweno.pdfIn PDF document text
    • 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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 11220 bytes
SHA-256: efc37b2cf332ae163e4664f9a5701ef67e49210ac7e98a249ac5dd8ad629b3b9
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 17488 bytes
SHA-256: 4694ce53ab309fe6c839b9559b4078692f3b211e3a64338b946a9f24f664a86c
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.