Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79f0a79fb2c6074…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 22:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c9fcb55cfc4222698ea15d7bb5b6a8a SHA-1: 590deccaca426052a26b266c172219b56b609d5c SHA-256: a79f0a79fb2c607484d33cf9b50560b572dbb8dec24345f84dcfccb04af4b78e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the links.

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://wastran.ru/uplcv?utm_term=cubital+tunnel+in+both+arms PDF link annotation
    • http://zanethompson.com/userfiles/file/29865620359.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/ferojegajozame.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/84169709186.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/sidagovedoxutupupu.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/8965676491.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766bb268---46630231083.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/79725578361.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/51855006034.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pezekatadozonowebo.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/milup.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wugidovoberaz.pdfIn PDF document text
    • http://esipro.be/userfiles/file/34561899564.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/58174092658.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/75582715260.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wabirifajewitijobali.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/50898617199.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tinugibibakazoneturum.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a33038409---wuwofitakabadobubipo.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/bimod.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/vupujolujovotuvon.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136511925119---86930468009.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/79367911040.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/49878126112.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8f38b75b---runowoziza.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/risanosekovorezidigi.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_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 17216 bytes
SHA-256: 37a97ca2a3b1281c95996c71209d5cc01811c5ddf5ba0cbace0d3b54f2fec5b2
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10644 bytes
SHA-256: bfd3e701759acd785c3ebded12a823f17d3294b18793881b35e5362ee385eec8

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