Malicious PDF — malware analysis report

Static analysis result for SHA-256 f262c9993a5f6395…

MALICIOUS

PDF

80.5 KB Created: 2021-08-10 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85d21ae74cb4e99994d7844f66185283 SHA-1: 22cbbd20e6cac262c4777f8e2718277184622315 SHA-256: f262c9993a5f63959fe8eb60f44fb879b63d4772e03672b7c0d152b452e9fe2f
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and other PDF files, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=dragon+ball+z+for+ppsspp+gold+free+download PDF link annotation
    • http://studiovalentini.eu/userfiles/files/musifejalopof.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad9474c48---70880987585.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/pubodo.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/bebinosezibadenasotumap.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/purutodorinekuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c225c1d60c4---99281828950.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xazoropudenax.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788923ea5---razaf.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bj047uask4ei0phb3jmkgrh7mn/98898048698.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8d360d8bb6da2669ea1f50e2dfd88024/rebezokire.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/vitofafejeni.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de93976574890f6fe190191585e32cc0/11467949983.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ea0ba8a06de1da7058a1c994e102a5e/93370602659.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///26436070520.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/43399048332.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/demor.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/29116942424.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/fugevozegigobe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f6319f0---17798188541.pdfIn PDF document text
    • http://euro-ex.com/85529990698.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55236f445---xuloz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021071221332973499.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/dolifarigazarozobisekejom.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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10768 bytes
SHA-256: c85f984d0687dd7a19b6b728f885c27961a91365816ff98618307f571818b1a1
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16848 bytes
SHA-256: 07ffb0b22f5b551ad18bf298c02c961deb7fe39c25823fd1e5ceaed4c7126dd1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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