Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2962a37b7afbcf…

MALICIOUS

PDF

92.5 KB Created: 2021-07-15 16:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 07e3f7f2031c48067b7ddc92c2c489cc SHA-1: aca18f280653005e0a61df2d73aec54314fac6b6 SHA-256: 0f2962a37b7afbcfbd8222c417e21d3c7c069cd482aa4a364f0bf45144202a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160838b27dc442---nefigodurexapoxopem.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e304c942168ea8e415e85c781aea0cfa/52586516504.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lixevajemanemufewum.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086170315883---tukopadoratavijizidosiwi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/74f56c15f43ed595004c0d4411c3515b/31826186237.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67e2aee8e---12973564043.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/76561227137.pdfIn PDF document text
    • http://trevorhannant.com/xijigutonulumaromep.pdfIn PDF document text
    • https://altbuket.ru/files/gasoxidazogosomomeli.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/biguwisuzasuto.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/sezobo.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/6600827004.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7acd381d---vomaroworevi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/deb268449f6188f1bf4de5444a83ed0b/94987544028.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d4245ebb---dudubesadufedam.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090ebb0619f9---gikuraliba.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090671e106db---xuzemesabofenuzevoboluviv.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/85181484534.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/25252735197.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/29600710282.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/35259125964.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/73289379916.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/234bfd16833a8ac3cd73a7abd8da2c49/10295775791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=school+cleaner+interview+questions+and+answers+pdfPDF 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_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 11188 bytes
SHA-256: daa06e61267bd94a6b0b24cf6039e9418d7be78639675d1c13a20abead3fc5a5
font_02_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 17020 bytes
SHA-256: 6af7ab018b57ec6ba5c3270b7d127dae39c92f7a770ea047b795ec752493e91b

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