Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cfeb2ebdabbbbf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 09:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 524a2c69dfa7c1a8c7ef50691ef763f7 SHA-1: 98a9652f6bc734f24e4224d60137d3490bc21d1b SHA-256: 98cfeb2ebdabbbbf92f6bccde8bdc992370146ef5b9663f330c7b21ccf24b1fd
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. The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=stomach+ache+for+4+days PDF link annotation
    • http://huucodatlanh.com/userfiles/file/pofener.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb895bf84---36465655105.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998ca0e3bf---20853743504.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/52536714166.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/wexapalilo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rps3ndnff2826htc0mhnpct012/nusopokikuzoxagonu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/75871142940.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/87794167087.pdfIn PDF document text
    • http://servmed.net/userfiles/file/66168010244.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gutukaxirukukunavof.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6rl9b3plbohuemtq820dnsr6dg/72148904206.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/befaxatikugovamesesas.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ggols288di8h912vu0ot6pvg21/2164807088.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/lasonexuwemoxamepot.pdfIn PDF document text
    • http://techmechengineers.com/uploads/gagitivamesuw.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/95375596381.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dulopepenomo.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/39820635433.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7e4babd5812c30d4e159b88958f931ed/23522455035.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dr4gi0ahtodp8p2aekte9ncvlf/xixofexevelugup.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/94189463029.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/7271315077.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 10768 bytes
SHA-256: 6d834f840dd75f41eabe14416d9cdc7737314e24aa4429d50860870e5d1856c8
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 16648 bytes
SHA-256: 79c5ed076ee0ead2d63127df750c8dcb9cc404b9d6d53aa0e9ffa5800e068975

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