Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f281a6a2f87f337…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 09:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29f7c3737fd14ca9713d5f93c416b01d SHA-1: 6aaf44d2ae575e57c9a2df54fe0b5740b825d9bd SHA-256: 0f281a6a2f87f337d05b9e796b18d7a119cb250d5191681e5be9ca0dccd48e54
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.pattyn360.com/upload/forum/files/40060825469.pdf In PDF document text
    • http://sinice-rasy.cz/files/file/95955162179.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/24278704364.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335867b8ed0---81108009693.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5it6m8fpjib3ii6hj7u8ruaqkn/59232082712.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sakisifevuxalavepemiwan.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359045bb5fe---xawafomo.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/tusotapekegejuberivip.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/29429149325.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed70dc72cc---nalefuxugijiditiwuzipavu.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/pawivuzabadopoxepowew.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/43499533307.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/wefedadifotojidikuf.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136882494a9d---22362606413.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/86138066056.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/gadalof.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/winigapuxobogunejevafe.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210905005314.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a3fd40ed---37149623662.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tetodefuwibavovamejujopaz.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/36446718529.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/17953368563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+apps+for+android+tv+2020PDF link annotation
    • 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_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 16572 bytes
SHA-256: ed1b4d519251dbd36f4e126227ed6a3a2a297c297018b8e3246292e8de9ed695
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10804 bytes
SHA-256: 8484c372cb9312b74ab457a6592da309900871e281be43c69c08fc4004480fc0
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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