Malicious PDF — malware analysis report

Static analysis result for SHA-256 953ae8b5d042cc9b…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 20:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbcc873601874cdc83dcdcc6769a5fdb SHA-1: d89bb3b04b1ad954d87f8dee260c39d0eef0e106 SHA-256: 953ae8b5d042cc9bbead36062e39c8eafffba24c023a84fbf386e7ba1cb5ed05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=how+to+calculate+net+revenue+from+income+statement PDF link annotation
    • http://fresh-j.info/images/uploadedimages/file/tukam.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/tibekoso.pdfIn PDF document text
    • http://93564497.com/userfiles/37633161160.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/difibewixomapefaka.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/267c8d5532aeab5857d6577fc0122573/92687337980.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kopenag.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c306842dba---rabeluzepa.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/28009779115.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f7cc69d9---vanud.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/20352447154.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/616ec7e39243d947e93f1112e8d606ef/fiwuzezofupesijizeb.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/45148162999.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cebfd2c90---29831350674.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/bonavujununeju.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/momaxisajoji.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rupomododagufogawepikifis.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb498b57e5---48761571211.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3259c9f46---88846910974.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d8ece146deec3fca9d7701200b017543/92236407502.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17304 bytes
SHA-256: 6f29343e7ce605cf1770bffb19f7493e7f9b3395fd64a7e60a3484d422a423f1
font_01_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 10740 bytes
SHA-256: 232cec8cae66b738d8016539efb2d3f6a86518bcf27372435fb99eb9bb0a1546

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