Malicious PDF — malware analysis report

Static analysis result for SHA-256 494a4faa8ef2267f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 08:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 193f8b5d445c0734aab4594bb8bd4d42 SHA-1: 275ce1d79c94c93009a113276b91064a75466ddb SHA-256: 494a4faa8ef2267f465f3991cbe7bd626d1b7d3bf9b139abf56dd818f2f61836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=instagram+new+update+apk PDF link annotation
    • https://danielfelber.ch/userfiles/file/57533035011.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210911095152.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/koxulezasatifumev.pdfIn PDF document text
    • http://peoplefoster.com/pliki/metut.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/55476884241.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13308286047.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907063107.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gezetinunesebofosigifug.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fosometuduvolanoxixifi.pdfIn PDF document text
    • http://martonelektro.hu/files/file/27952446603.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/wizajekonetaf.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e1694e3ed85f40d337cec26d8646889/27770512440.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109042053394861.pdfIn PDF document text
    • http://irollee.com/userfiles/file/37528880583.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/19082522046.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qco8nsthh5ler4ik3komv0n8s4/85306276673.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/54294187403.pdfIn PDF document text
    • https://blokhol.com/upload/files/taturomavuziwim.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/givexiwubasirevobidepipam.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/zulanejapi.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kuxax.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a3334d49eb048c4375023321db5c601b/timerodaloluni.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/43288003746.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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 16744 bytes
SHA-256: 9f70485507577b4962b3ecf7a6c4513a269ffe679994892e440f12a94cc909c4
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10708 bytes
SHA-256: 7edef7e30ce7c16bf2361129defac85f98ec6c70752071340c8466b23c116cf4
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1