Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1d80e36a4857ce…

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 20:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f86ef1fbca82e960a53ecece72932b5 SHA-1: b73f07e1bf746038380f1eb49a024446c8f45266 SHA-256: cf1d80e36a4857ce7441fc0ccecf10d54e5daf927a4e259ad55f015ecdc0339c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741f0f4d166---jokevegadisifejakikado.pdf In PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d244253c01cabfe831c222b6eb4d4cbf/tetevidogutajiw.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21aaf316e8---91566865616.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/143184c92d2248e41832284cf82123a3/bitazojaxonufapab.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609319dea9790---lefewe.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/28455077537.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cddce988f7abf30101bb9ab92a55ea7/pikafebodafisodive.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5524c371e53d3fc26c36aa7441e9e7b2/folamovilamamupego.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084763aa734a---6076003036.pdfIn PDF document text
    • https://peterdegendt.be/file/nisikuzonenaxunosanuke.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e0b9e8e4e---rowisiwipazasu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e821a59d---38546421994.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16071925645ef7---38595587666.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/64032309877.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/11571547871.pdfIn PDF document text
    • http://elma1.ru/!upload/files/32753133166.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/mebogurobujizese.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/45854342876.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/zasabuwigukeju.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb5142297---54873012790.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/83127848890.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0055cfd9450b564479682a7986560c27/vokomofiwuxidofodifanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=zr+on+the+periodic+tablePDF 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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 16616 bytes
SHA-256: 8751fa5528946dede8af63bf02017be5d026d86a12e82b77e865839aee8fdee6
font_01_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 10548 bytes
SHA-256: 15c4cbf9a2c5188dd8295bdbc9c2f7baa4002c321159117a4fa81cd47860378a
font_02_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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