Malicious PDF — malware analysis report

Static analysis result for SHA-256 290e005202d37185…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 19:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcddea2d8839ef7bd4f90e9c88c9183e SHA-1: dc326599e2da6c46916094dee3a63ac7c33d6037 SHA-256: 290e005202d37185b28a925a4895f03c2042fb598e44a3a9bce0ea5cf4358aee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's intent is to trick users into downloading a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=the+spirituals+and+the+blues+pdf PDF link annotation
    • http://pecsimutargygaleria.hu/files/file/roduzub.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/vipuwinabamuzi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34043708383.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/68143540758.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb802e67a1---619275753.pdfIn PDF document text
    • http://schturman.ru/files/files/farowexasizuruzilifef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/477215169e620156fa3877fb228d0330/45790466920.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/11759365110.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/27536889250.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/nuxujafi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b93105f1b---vefitisix.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/nenokakudefaxeriguvomi.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/govikibeni.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/78832807501.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/80340716785.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/87599875817.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/pikeratirisibinopuduf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777288961ff---92381657687.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/47853567617.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sopavidanexud.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/13207654128.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/3797185813.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/povasivexipuvivexu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5decc5167---9915834560.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/razezonimidisetofizafuze.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10676 bytes
SHA-256: dbbcf882caeae3e3aa2fc600c7f7fdddf93ac7f377db58a0cd5de9c9bed9ba6c
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16972 bytes
SHA-256: ed63bdb4e371683a5dea9a895f1f98a9ff7eb7207b5c515c6ab86c5875d5841e
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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