Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b36e6e1a173c469…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 13:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91fb07e673cb96b67c1c0258e27c678e SHA-1: b297114fde00c2052ae85c3f87c3ed431688d5f8 SHA-256: 0b36e6e1a173c469a2a5be59b3021919d3c4b42938637683a3e06d10ba6cfb9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document being a link farm, directing users to various websites, some hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fc5qkkvkd1vbo7r67drn9noaq3/3322539934.pdf In PDF document text
    • https://edusfera.pl/upload/file/29463482010.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/10985862369.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6292afd4---20699053727.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609517919fa3a---59037816725.pdfPDF link annotation
    • http://www.celso.org/download/toluzetizasasad.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/45305252748.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/xewaxigebitimugenewebema.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gemopubufidusepezoxasowex.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/mapezofinabegasigepafejox.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/81016412989.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f6a70cd1---10727274214.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf510c2ca97---20588175585.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4bfc2e2e32eaea90b8553c1662c8b0b6/pivuloxuxuxak.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/81967391566.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/tizivuvobabugugulubu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f5677ba4---84215067168.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160730ccbeb8f4---musidonuraselirifidebo.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/pamibobemam.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/21395399405.pdfIn PDF document text
    • http://techmechengineers.com/uploads/54033874790.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160768b173ca4d---dozowuk.pdfIn PDF document text
    • https://papiratisk.cz/soubory/58814269343.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/29358828716.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c059fe4aec---11602490334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=agenda+2019+editable+gratis+pdfPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 11136 bytes
SHA-256: 03e9ad003e9445234168d4f6727795704df3e4f70985c29b407ab19ae06e5c94
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 18404 bytes
SHA-256: 5ea5438ec275a7bb227fb33725039f00e4e53eaa452ec72df8c24d7efdfa9be9
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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