Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aaa6895ab25af3…

MALICIOUS

PDF

80.5 KB Created: 2021-08-16 05:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f6a8ffa99d1b2dbd24003b6a3c0ff78 SHA-1: 7a36f7f140732c26d8fe34e3683b37cd7e22ec38 SHA-256: c5aaa6895ab25af3d053fe4a746fe69916754a36fc6b886cc651e887cf10d2da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=difference+between+defining+and+non+defining+relative+clauses+exercises PDF link annotation
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/788dd00373a43e2dea170f9169b46ccb/41245843442.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/41302004933.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cdf8362b289fcb137003ca026bc67ac0/kujonigozigape.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53bc590f91---18599639475.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/doxiw.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9197b5561---85784565329.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rasipexolo.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/8666905360.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7237040955fd13b29a317b41a406166f/dunarumonube.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fovafibu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cf9e7a35d---44949850532.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e3126aa99e0ce58971083ad6bb07d7bc/dezatuvubawakiwesonilu.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/tuturesejo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd47b73eed---33309960252.pdfPDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/73428f6f9c6d7f419e5a22e015813f89/tepelepopowusimezu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/49408758658.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/61816219337.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160987029245c6---92647126160.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/sadakaju.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44901988c---24333967804.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6e6cad93---22478484060.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbaea2539fb---gowevalutenogijakubotugox.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/pafulijomilusoj.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/66458643982.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 16308 bytes
SHA-256: 64dc2bd4e47d23325af86187d903c6d898ffe698b0cc503529d84d2fd52627f1
font_02_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 11144 bytes
SHA-256: 6ad236e8a65efac884b333a235001de832bcb2ce6ccdf259976a83d30b4c2ea5

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