Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5a65246ac80eee…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 01:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c2633211887f2f5f045e77d0a7a3cdc SHA-1: b39fd0ed72b218c913789cfebbbd42724dd5859d SHA-256: ae5a65246ac80eeeafd276b8e1f6789b72e769a20034294e9acf6ff0ae2d3d39
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to compromised WordPress sites and disposable hosting, further supporting a malicious campaign.

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://pixomot.ru/uplcv?utm_term=application+de+gestion+de+stock+en+java+pdf PDF link annotation
    • http://vita24h.com/uploads/userfiles/file/bekomexuwapazidojowuzeto.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f65tscfltuj4oekduhhuunif54/bizikadabutudozomitibuv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/08a9ab2d3b21ed682a8e6db3e9166e2f/rofulinokaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c067f93fd27---1295746171.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/zenigavesugumifi.pdfIn PDF document text
    • http://alptw.com/images/files/ruvuloli.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/pefobabow.pdfIn PDF document text
    • http://actinq.nl/upload/file/46948961931.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sozefazodupewikoroge.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5348dd8b1---95483035627.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f812a199---takafejesoxugedesux.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/93990370918.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952e194a077---rorifarokijepofapukavu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/buwavetiporinenuk.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/24704357585.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610973858fb8c---nemitabu.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/niwafovijujiset.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/19342075660.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/56046142522.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa67fd50392---jusuv.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/59698507801.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c96dba63b---fezagotoruvavetagefuvine.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d21cb267---jixiragamubuzomivu.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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 19208 bytes
SHA-256: 1890fc32335bb9e933124edade61ee1255d10788f9d80a0607538bce9c9e8559
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 10964 bytes
SHA-256: 59d82884b3b9e6aa5920a3b06f8f78414a77e7f55e7ede6c03880028d3fcbc5b

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