Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a55afa28f889d5…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 20:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59aa38e71e5df3e7554b01338eb99baa SHA-1: f9b29ac314646482677bcdb6156c0314b5123c18 SHA-256: c5a55afa28f889d54018121b29d87070b11765a159a3298a938905f6b6469186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=i+will+call+tamil+meaning
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9s5gff1snhlu2205drdrdrorr2/54546506271.pdf
    • http://csc-021.com/userfiles/file/20210614092720_ubgvht.pdf
    • http://citra.cl/userfiles/file/72969141131.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a615b353---gufududaxepilotugazogok.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612d8973982f93de3b2f272c660606bc/dupuvarifirajoxoxemo.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gdrp6i6lodsjk87p4pntfvo97a/bekivosudelaj.pdf
    • https://zold-kommando.hu/files/noxevisaxoz.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5657b865d2---gegakido.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/95899af685bfe463833e72ca766a4ce4/14598975965.pdf
    • http://krevue.cz/UserFiles/File/fevojixegofa.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074460c14c59---67852921670.pdf
    • http://russkiivopros.com/images/FCKeditor/file/bovefokigupo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede8b8b22a---34522899380.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rckbtmf99umnelqqjce2hk9eqm/karuzeb.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/rugalulevalaz.pdf
    • http://podiummoda.ru/userfiles/file/takeniroronufikek.pdf
    • http://ombs.ru/uploads/files/13152145253.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/067qfoatn0lu813pl35mfjb8rq/tasofuwovawijowiwu.pdf
    • http://sosnovgeo.ru/userfiles/file/temubuneposedorepusiwubix.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab47a4e8d0---29490305445.pdf
    • http://ibb-online.ru/f/file/90169048283.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7404733bf7bd3261fb25bcd97759aabc/55129456202.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df486bcbe---ladokiv.pdf
    • http://technoculture.cz/admin/upload/file/rukabine.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_off0000f72a.bin
7932ecad731c066482542736e8939f307b36b4df3750bd46aab13c980f689365
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10220 bytes
font_01_sfnt_off00010e1b.bin
b3a2820a052962a91e5402e6506bf4725f2102f960011370aeb149d6dfaa2122
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 20144 bytes
font_02_sfnt_off00013fcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 16792 bytes