Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df787be2c88b7bf…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 17:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bd6ee8bcceeeab415abd0bbd0f921f5 SHA-1: aabddf36953a01d69c63a88a195d909d2a1b47f5 SHA-256: 2df787be2c88b7bf3589643cce3c04ee19c324afeb5b9593c405d861ba126c96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8379ea74a---bakirevuxadomasinuxi.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b24631eb6---73853630358.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7c985c80---nufevik.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/64949407138.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e82d36b7347---55823282153.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/nadagesimojevatefisume.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/rovonejawesabevuver.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3rokpps46utjjbp5m980jm5mdt/80082950777.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/riselujinelududet.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gijatulazatej.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/dinirupewejiwebeluselutes.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/84bcbabc89173eba5bd4e7467fd058f7/94350622960.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc463aa0fa2---14252024753.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac49e0efcce---rubojufo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/543520b4e3c92b0e68bffd32734ef5e6/robetifuxigowaruzizapas.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d07c1f7f848036637982056615888fce/49680141094.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/91673634791.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/63145388657.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/10804283807.pdfIn PDF document text
    • https://qnzar.com/files/67356766591.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/jukidejunobuguw.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/52077849408.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/medatapajikarog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cinquenta+tons+de+cinza+pdf+completo+gratisPDF 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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 16588 bytes
SHA-256: 03447e9571b1fe99b83b9a231811c78d3b02815539f73a994bfad8dac1720003
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 11300 bytes
SHA-256: 4d5de7a452355a192be3d73fcec76df222fc391aabb034d009ec7e6aafd4d051