Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b023b6f7a4ce709…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 02:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50fc1d351e35da6942fe9d6992f0865f SHA-1: 3d0d9bb714b2b91e21e7e0b77c921d75742e867a SHA-256: 0b023b6f7a4ce709ec578a8cad1b8dfb6f8ab04078bb1717b21fa0b3a67d991b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=photo+recycle+bin+android PDF link annotation
    • http://studiogeologicotrilobite.com/userfiles/files/feromidumevurawisanuborex.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/25310589171.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/mikibiromap.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/20853818014.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109090401482647.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090522285670693.pdfIn PDF document text
    • http://keitbg.com/images/files/bufopegitid.pdfIn PDF document text
    • http://kd-council.com/upfile/files/51393974958.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/sasutewolidomekojoso.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613666135a9cd---26065179166.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/74480396339.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/71117809231.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wonunanaribojimoxa.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/35bf9e3ba13881ce3f8b1892f3645756/pokekoguminezibipokazona.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/20029690000.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614618737273e---44311667236.pdfIn PDF document text
    • https://manenshop.com/upload/files/52881027817.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kaxelizazovakowusezejude.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/18927823117.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/17773992295.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333a81c18bd---pefazepidadamokirex.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4938fca22f6b0ed32e6a87b59f61b4ff/zurixorimeregodegekav.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/13214645886.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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 10556 bytes
SHA-256: 83286f62f5112d5f50748c29d4b97b85c74b6f7def11dd12398fd59ab902ea53
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 17576 bytes
SHA-256: 3cf9ef09d83877d2a40fc8363f93fe6b45face6cd8a166dad397dcca18f6a292

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