Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f92b3bf0f98315…

MALICIOUS

PDF

95.4 KB Created: 2021-10-21 04:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e4b45a5a32aae62bef1030addda902f SHA-1: 2ef25ee755bf7f5cbc9774ecc4204e396ecd2e56 SHA-256: d5f92b3bf0f983155e73bf5e67f2ae671b6db6d57e7988c80a98a6dee92307e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://chcial.ru/uplcv?utm_term=past+and+present+tense+worksheet+year+2 PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/80625441910.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909220851.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/26845164005.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/nupezaketoz.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/54125646978.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/jefoxafifesex.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vedotamufafojolisivizeves.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/bumadakopovezu.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zagajiwanokofasigebelurub.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b2a1b312b2---xobap.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/zomepafibo.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/vegusidobalijujeli.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/44308644472.pdfIn PDF document text
    • http://beta-rc.com/upload/files/sigifigex.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/61041556958.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/kenuxozopisazafiwol.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/11519448399.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5a411963---futatizejatisotufa.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/vexaroparazakakeduluvum.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/98363374341.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/95748723240.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/ruferafovu.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/mulodefexizorusamimame.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/gujonanebima.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1616276d6df5b7---lelewera.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/gurogifedod.pdfIn PDF document text
    • https://isosklo.cz/uploads/dakekudem.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_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 19264 bytes
SHA-256: beae0e29fe3383f96a18b367b05ab2f64eae0b7a48fcd81972b3a80c1739ac6e
font_01_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001566d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566D 10764 bytes
SHA-256: a628238101a02476f11baa35eaae8c83751e8fc2670432437140ff0935718742

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