Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f80592f5d6684fd…

MALICIOUS

PDF

75.7 KB Created: 2021-07-17 18:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a7e3694b55a39299abb36b0eb108e8b SHA-1: 463a586627816afbb4e1f0ae1b38d7700362befb SHA-256: 0f80592f5d6684fd1530ec7e92a305064086462950e6ade54970e6c7bef12418
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, including compromised CMS uploads and potentially disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://turar-mussin.com/userfiles/File/suguluwopapelapofiwuz.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6tknjke0cq59ab9qg2vqmvrake/kibodunevulima.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b245d0d09---65858473936.pdf
    • http://vstarmp.cn/upload/files/20210616_072232.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4f4aea3cc996def9791dd50264c23303/buwokevoxuvepuxepi.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce260d2b86---92516441114.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/paduxebifut.pdf
    • https://12tiga.com/contents//files/repebifolipaw.pdf
    • http://lblussana.it/images/file/239071111.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e52fed4bb5084a41dfccee51a09d14a8/jenosapesowadusakesop.pdf
    • https://arch.ua/ckfinder/userfiles/files/norivupetele.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/badovisomipip.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d821700e---zonerawelixukogazavori.pdf
    • http://yossy.biz/userfiles/file/kuredoturu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/slo70sm4k0n5h803gpa6kh4kci/vugexetalizudowag.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/163bacc5a1f8bd915153f644e893340e/ropon.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c133cd56879---zinifejivebesozujar.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/xasazutat.pdf
    • http://auxerretv.com/content/public/file/62578038666.pdf
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/jofebo.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/vedamurozelifapugimetut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=haralambos+and+holborn+sociology+themes+and+perspectives+8th+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 16792 bytes
font_01_sfnt_off0000dbc6.bin
5438c8829fa0941c1cf4bb5120271957e2860a625f0014042e5851ce1d5b1f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16296 bytes
font_02_sfnt_off000105f5.bin
bb8a33118389780dd88cb8d29f633f7a1a152265eacdebd70221eefe7acd9604
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11584 bytes