Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b3b2432981ca1b…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 16:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8b8a7cf45472b266a37586618f84233 SHA-1: 1302e2564746d5e39194200ae6bdb09d66394d7a SHA-256: 56b3b2432981ca1b072aec13eb1fc9e407f467082fa4b0ba00d21610ea1f1ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly suggests the primary goal is to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=missteps+of+a+young+wife+pdf+download PDF link annotation
    • http://salukool.ee/upload/userfiles/file/tubawemexuvilepi.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/robabi.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/wiradi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zepuzejefunebegapemako.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/tubefokemanas.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fe7e455c189e48cd4eff5089d61ab0ed/88611310615.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/j9f9br544vkieemhjqm0uihr53/kosunegowigofekigi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/zufumidiloviw.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a05ok3a1dssbdsrvbf2f7rier4/87172208660.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/110636477.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saleziwopurugujis.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/resomegujodureseruz.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/96834397619.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b40809d4816---94759181771.pdfIn PDF document text
    • https://csn-alliance.com/data/files/58372995466.pdfIn PDF document text
    • https://petek.biz/resimler/files/11978812923.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608082f7c8fbd---powuzotazinu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/16575347222.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/87609440921.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q911dtoujtf0eu7fqm4da6mup5/13951403947.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/xuxepalip.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609072238e350---dafomavaxelerut.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/12359967033.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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 17796 bytes
SHA-256: e881dbf1f4802cd02bc54b423d9770733106b7339a750d835ffe744682548d67
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 10868 bytes
SHA-256: 8c5f97057caf55b9c384afdf5cf7143149b157798c5c9e1a6131b60c2d0a5fe4

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