Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccf29ad98dc34b3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 00:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0aa3975103537ef27202c02bd6816197 SHA-1: 5ab6c5c55e2d45245afd63ef767dee04fac67071 SHA-256: 5ccf29ad98dc34b35c798345edef4d23e3ef488727f4f09683f19e2338150697
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://plncse.hu/php_data/file/83759525519.pdf In PDF document text
    • https://coolinterier.sk/upload/files/bafewubavedetodudo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/25b3d6cf21d3904f5d799accff1f5265/16574105808.pdfIn PDF document text
    • http://drironcat.com/images/file/naronisujudovo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/205420ccc277d7ed0c4af3e9c2f361a0/fuwiwivetowegopanuledoda.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/zokubuwe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f9832e0fc9d6bb3f2d9fe52a69f799c6/94069873127.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i7tq4rag6smr7gke3fp65qlea5/giruzogurebexopevi.pdfIn PDF document text
    • https://puppometalli.eu/file/89395271123.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611154c635805---37841167717.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc89af280cf---sesotatubero.pdfIn PDF document text
    • http://balone.net/_upload/file///10536153380.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160724bb646816---tomadedisijelomijodu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57367425351.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e560b28b33---9311438045.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107c57774c1b---93574145073.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/22249189939.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/82537631467.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/ziril.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b606522c5c8c0ac88d91a5ee21beaa06/boxulep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=exercicios+de+geometria+plana+pdf+projeto+medicinaPDF 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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 11180 bytes
SHA-256: ef82b5bce093155d8a9f53e47713528674c01ca5451089c7b843bf17f0ac3489
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 18540 bytes
SHA-256: 0992f4f5ca33e377b0abfbb368c4ec10d0848c12ab15ac0178d9006dbb1bd2e1

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