Malicious PDF — malware analysis report

Static analysis result for SHA-256 317fc099f19cb457…

MALICIOUS

PDF

78.9 KB Created: 2021-09-28 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb9e800d504c57a1b1a7cdc39943c032 SHA-1: 17a6ee309aa29cb11a8a071d60a2125cbc82024e SHA-256: 317fc099f19cb457e9a207732fa10c532ddd3ca2cb725a9c54f3de59b72055d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://cisseo.net/userfiles/files/74040703899.pdf In PDF document text
    • https://btsis.com/upload/ckfinder/files/62680390306.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/11105440394.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/13749357384.pdfIn PDF document text
    • http://fgosvo.ru/files/files/raraxalunozogakopit.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/14985896832.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/poguriga.pdfIn PDF document text
    • http://spharma.ua/files/file/29653185373.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/motojegovuse.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/gegasigamekusavopum.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d099434d9f---89317352164.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/14737422726.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16151f831b8c73---nufisamutibitatoto.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/83192760340.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c656e9b9dc1586a11564a6b5de9786ad/19570066577.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/35347310169.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/22505287705.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/wobezobuxawedidexap.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/59277850789.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/lajunijorowoxunomusani.pdfIn PDF document text
    • https://allianztc.ro/files/file/teluluzipalozuva.pdfIn PDF document text
    • http://lex.tj/img/file/sodiluvavip.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/mozilak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ps+touch+for+android+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 10732 bytes
SHA-256: 8d13257b4ccf1fd766cce937c9d3cd75705d0eef718305b955f9803c5d1c9296
font_02_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_03_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 20128 bytes
SHA-256: 91e0766ed1065db71638839f7c711dc72c33f72a8b6d903e82bec9dffc99690a

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