Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d252c2631873bea…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 22:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a10299b929289cd13268908b594848c9 SHA-1: dee13e33e174d9fd3de511e57380570a6e0c053e SHA-256: 0d252c2631873bea83a9f2d0072d6c1eb193cf3eae12d90fa2a6b9a45389e1b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=canon+printer+driver+for+android+mobile PDF link annotation
    • http://sun-green.de/ckfinder/userfiles/files/tofaxelefozovozetuv.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/suxajebapesujezujisinoj.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fuputokaru.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/80877360796.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/nuwabutejajabutixuna.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327e29cc0d6---lazalipepisiruzabuf.pdfIn PDF document text
    • http://manu-transport.com/documents/file/97189390157.pdfIn PDF document text
    • https://senfina.top/uploads/files/22520128874.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/36768076076.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/dotofazigajolixudusunizu.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/47755605860.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/69349947037.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/68535366066.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bimopuwidosixuzenijilares.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/65791955475.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/10578220422.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/59168807094.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/67079790211.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f0c6bca4d1878b2d5447e78dd8a2aceb/85680514202.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/96287545598.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/faxokarofax.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210903191316494.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/35tnb1plk56938n52s7tsco1e0/mezozumusaxupizisabezuba.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/31481608487.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 17168 bytes
SHA-256: 7e8b0bc81c90332b1bea50ae0d034bc54bea0908bbaed032748973edb1fe30a6
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 10728 bytes
SHA-256: a7f2ecf11ad93d573bad32420042a408c0e852526c6bafc7983d4080683b448f

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