Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0fec49c2cb297e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 18:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90a494f296a422cb65728804f8cb8f60 SHA-1: e41ba36c186cad048bcf5449785b722089c554a0 SHA-256: 6e0fec49c2cb297e31055a7c9577b3775f18cec890b8cdbd43e395c435c94b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. One URL, 'https://infrive.ru/uplcv?utm_term=chevrolet+malibu+2013+owners+manual', appears to be a lure for users searching for specific vehicle manuals, suggesting a phishing or social engineering pretext. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution or phishing 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://infrive.ru/uplcv?utm_term=chevrolet+malibu+2013+owners+manual PDF link annotation
    • https://micro-churches.net/uploads/file/58457459170.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cp8mpr2kdu448f1c9rk9an86vj/506786670.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ag1fkmi09ctg2g2jomslste7b8/29080528617.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jewozefomaripif.pdfIn PDF document text
    • http://houselandia.ru/files/fizemarogaxakesulan.pdfIn PDF document text
    • https://langumeistras.lt/i/File/51486237316.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/bawikilujitiluso.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/96643113781.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3f0c7b752ab4cf705b88d5222f1c6372/bufesobovetijomukux.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e652a429690---14393740894.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zuliwumovunewotilunux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb76c2e16---vobikomeliriribuwe.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1629796401/files/28203607328.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5cc5a183b---semitulijamovuvetugadum.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/70508101264.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/8202810985.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xovabodutepojaza.pdfIn PDF document text
    • http://client.diffuse.info/files/85197870830.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/86052049626.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f2e9c1b1784ccec086df42d7c2a455e8/73943074780.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/020709346150.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/41010106213.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750bec93403---joxoduzafi.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/72940537957.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 18124 bytes
SHA-256: 04d339b4e2f21641f2a35ebd3a1185d2984a6d1420272d81d2321423e3a74fb0
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 11264 bytes
SHA-256: 06a8fc82c5530b8f6e7b7d8303b113dd45d92fc7b61e71f52f41b69b3a1a726a
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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