Malicious PDF — malware analysis report

Static analysis result for SHA-256 c150efa8fd5298b8…

MALICIOUS

PDF

91.1 KB Created: 2021-07-04 04:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6cb861e9b17d764d62392fe56619c04 SHA-1: 43c57ffb2243fa3020bb6807eda64344475caa66 SHA-256: c150efa8fd5298b87306de0330a93c4183dedc20ca396681fd1683aa2b9e83fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3cf5f5fe8ecd1a325fe7edd83d3bb104/fosodopezeminovibula.pdf In PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/75524095769.pdfIn PDF document text
    • http://ridendo.cz/files/file/nurofixipumijiforu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/gerovirulakulozosuw.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/47607855140.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/miwemodare.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/03f37dff015c37270dcedd06fe432a04/54945548563.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/sixuzojanuwadof.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/82637086455.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76401d8b8---23145400399.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/765cbe98880519c7b391e466ac26c3bd/xovovopefurivadizuji.pdfIn PDF document text
    • https://2acontractor.it/images/file/bodabogixinuxisosisojus.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rvge35bvvpf3ahef07jik4vq2v/9678626384.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041a46d7f5---dumadobasiwize.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e693d394---9766529289.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/907ac316216bd6b2a0f4a85dc15ed85d/27855932256.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j4rgq0alhq8u3j5gj8ps0unhm0/pazapobudotozakajowozilo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/oboactmgeksrjvg15jjrnh2sv1/69735919966.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/669bd37818985a79c85156e99e0b273e/66489000532.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bumexeki.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/9485442340.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/61100368585.pdfIn PDF document text
    • https://promise-land.com/upload/file/wemujifomagakedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vegetables+that+grow+well+with+tomatoesPDF 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_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10648 bytes
SHA-256: d096ce24cd198762cc7662ea39848dc6fd36dad4a7f81efb846fc4b7eb82fc6b
font_01_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 17004 bytes
SHA-256: 2f173f5c472c8111b27009f3e031bf0d4cdcc4865decb64e24ab4bc10416ddb7
font_02_sfnt_off000146b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1