Malicious PDF — malware analysis report

Static analysis result for SHA-256 614af0de3baa0184…

MALICIOUS

PDF

71.3 KB Created: 2021-07-19 20:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a293715a9a2762de13275fe1d3845af2 SHA-1: 60237d0256a52dc314c1531adaa2c09a40440451 SHA-256: 614af0de3baa01849129db2d0f504c8d47413f812d945d6d210b179be129efd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43566b3c2f---48818516547.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/41bb9fcafb2a7e651d92fdc353055cad/zuduku.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/87789949859.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/04116a215c6fc16377bbc80f066d5832/26862642277.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/20142845314.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa197ec98c6---84053936337.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ee45e8e85b2c73a4dc3836a7b5e6ad4a/82217211020.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16080d04c932d2---sefafusofe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/028b9b4095e0040e76afff1981565503/tawasuvawamebo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7059b1c3---rarokine.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2555515fe---99579186759.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8efc502b8---22801321039.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3966d27bd54e66f06077197f9d35ba2a/10147600908.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/2995617494.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4f15ea1a009dfdd472982548df92772a/zuzawenodetobisixitewivol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd5cb47ed---66242079661.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bbe2593e303e4656dbb899d1e3d8c3aa/57798656795.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/nulusapimi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/277f024414be1731b58216bd1f75f03d/81818375629.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/54275255935.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=two+step+equations+integers+worksheetPDF link annotation
    • 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_off0000b812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 10872 bytes
SHA-256: 474125bdf6004ffb23ff70f493691c771bff904cd72d3ea8759eeca27cccdf09
font_02_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 15292 bytes
SHA-256: d7fa8c1b31c99a489f9ecf60078cb2254268d1291b66ed137a61f9c42842bebd

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