Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e382578a467d8d…

MALICIOUS

PDF

90.7 KB Created: 2021-08-14 01:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56739a120918353037df6f6daa14b95c SHA-1: 3290ed3985a37c93d9fc2b92a22fe0c0be355c86 SHA-256: f1e382578a467d8d713065661ab824213b07b5df27c33c38fb1b054924006eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, exploiting users who click on them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=total+body+workout+machine+as+seen+on+tv PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e10c982dfcf---59087288138.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/52640f255030442279a213786c15b3d7/bovemerinijesuj.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/82956587265.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126f93221---legatifomolagadeb.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078753ecbebc---62510516610.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/98214079013.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/64b661024fc68468db9fff06505d3ade/98854232734.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/fuvijisixemarunafepa.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/95531476979.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85f1b8e0ce343a7016739d5da48a6eae/maweluni.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/sikiwebuzemupegifu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f764e6408---65244567562.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/xenibeziri.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d0419bf7---kunitalun.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/26714199256.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753bac11d9e---61430731406.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dc877197f359ea3db0839f329f02ca2c/38526356725.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/6966633312.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ef91df44---31286162558.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1c815933d181bf38fcbbf60316acd8b6/juvisejuzaxipanunoxofe.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/3106988542.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_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16652 bytes
SHA-256: 2973846fd3e282a38d020ba873c7a23946870c32234128194607edd2cfe6cad4
font_01_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 11196 bytes
SHA-256: 0f8ae52a843f77d56084279cbd364b91ad9972cf619ebf51eb296d6386ff9482

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