Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c97e2370349860…

MALICIOUS

PDF

96.1 KB Created: 2021-07-08 10:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95b2aff94d3a005a285dc8aed3ed12a5 SHA-1: 2e95f51806f39ff614aadaa9c977d854197dc2de SHA-256: c5c97e23703498602658dae8c74792b1fdb7a3bb06c91a1afef20dd4c59e7a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=incompressible+liquid+approximation PDF link annotation
    • http://savitapiti.org/ckfinder/userfiles/files/wejufakenizusoxixok.pdfIn PDF document text
    • http://heureka-cz.eu/files/mamulufudes.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fmgovjelpp3j9ouoftdkllc2ph/zojelanozuzewuzufiri.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc008f7eb---buduzepetujuledevulelu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bunedoluwovomiwi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/368kdsstnp1q33esq47a4eh13m/nenizerikusedadapotogi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65d64a6349---53067042762.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe56f5af4c---13049804211.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/buzezen.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ab50877056071d7a2ea9f7ac9ac01e14/xivetenusito.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/kujawimulomuxuzetomaber.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/17262774821.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f497cecd---97959767918.pdfIn PDF document text
    • http://bjjiffy.com/upload/jedolixefofo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/666851c05a9f0f5f00edee8ccb520967/69970677733.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/vujuvipi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/57928a0e6a009ce362159c1220a5d446/35959677188.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/mavoxip.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ec2c6e12---52735611510.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/rovosugujedububobukajub.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4505ebf467c3674530c9896213bbdf2c/wogujofo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/nozivapojub.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_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 19492 bytes
SHA-256: 8624ec658f07aa8af11490543532989ea8f78ab0ea728f7cf401796e9c25bcfe
font_01_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 11116 bytes
SHA-256: 0d2af036746cc7e9691bc0b743fe141a0fe546a8f4f4f8c157dda9c4bc48e453
font_02_sfnt_off00015b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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