Malicious PDF — malware analysis report

Static analysis result for SHA-256 f092f2574104d1f4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 01:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca83c2b3520b65b06e92644b5f2071a1 SHA-1: 3449942ce0b76bd0ac8bf6f989018c099fd2da81 SHA-256: f092f2574104d1f4bd991c22b91d1d1cf393a42d6b9adf397fec736a29b375a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=download+stickman+ninja PDF link annotation
    • http://kme-kme.cz/files/file/tumodanigopu.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/nedugujuzedogiwefiju.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/63810962800.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/zowinoruzageresav.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613873bf0f6ff---repuzapuvadugovorolijidur.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/46748257547.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210925085400_ei0yjp.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210915_113458.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pinunamemotofagelikipux.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8be3e850---1002813395.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/koxupowojipanojagezowavo.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021092520475043.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/bafulazelufudam.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/87703250985.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/20426031472.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/kinobutarosapek.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/xavuvimefixijipodapokavo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1e244a1ec3b43ccdcaee0425e7b15350/jipebunelefisexuvowusoz.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/39182401579.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/33367990913.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ql3qa728hee8jo4i9cad1tvp53/79810587247.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pejifobamoxarodig.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/kukuwaxopi.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/37473930767.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/20747335841.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/18035859107.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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16612 bytes
SHA-256: 9ceda0713f006ef49067074423a7cefe26c067b1afe6b45d18672b26450d4e18
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10608 bytes
SHA-256: aa3f35d6d0deaaac5e8e110cab7830461771994cc5ad250d8b77b97eb6d7d31c
font_02_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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