Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95f934fef5d4c43…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 06:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8254fb8fa75ab8998a97c8c8654a4f9f SHA-1: 96ba370aeecb15ceccc629e83f0bb55975db9032 SHA-256: a95f934fef5d4c43a106974e3ec0338355d0d1ec328dc07d08ac6d2e7f4a0802
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads or disposable hosting. The document body is unreadable, but the presence of numerous URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://vds-construct.pl/userfiles/file/metogu.pdf In PDF document text
    • https://vpntraffic.com/upload/files/navomozisisizemifirur.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/65716889791.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7065510ef1aa5aedab92a0d6ece64101/zavikomejakuvatefes.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/15604396858.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6d56492964f7f50723b67508f8b4643e/mewinuwutis.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/xezozuz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608211e0308bd---3237848261.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090490a09d17---11508044476.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/341738679de43a752d1fea184ee75bd1/bazekunomimabowusutota.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/43172628980.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/ratatubafuzezowavujin.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7mbg2pi4ph0hf46tabujjhdgd2/femizutijumik.pdfIn PDF document text
    • http://idroter.org/userfiles/files/komuveguzorara.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c7a73481c057f517b3c07bbffcb682dc/fajebirexoga.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/33129319738.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/vugumefalapaza.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/gureniko.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aa309ae97dc789d06bed6a2d3f2d93f7/faxokonetikupogaxe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e54f0d2956e80b7afa2b2f598150c12/20334131362.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7e63e49293e6ade61e6baae999d277d9/kiwizujesipovub.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2823848c---guludi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec33eccf16---dukusififeruv.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3334892e2---kotikurebojel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mela+indian+sweetsPDF 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 16116 bytes
SHA-256: 460ac77d3c4e66ffb862caf44cfcbd42b22fa7eabef83b8bb012cceae7956ac8
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 10100 bytes
SHA-256: e3e44e0087747b2ec7039ad970c32bc7a1711b707a43b2744693fc69fddc5129
font_03_sfnt_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 2712 bytes
SHA-256: 8f9477a2b6e094bb91a4fdf8b7ff061b55cab6ec3af4108750494698c1d3f3ca

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