Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94d042b17f93a24…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 00:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 239ff3e49a5015d5d127552d207e7aa4 SHA-1: 0763ff1b5955899fd274688b8c7b946bf73ff1c2 SHA-256: c94d042b17f93a24b3eec3cfbbf07c2bb9a0d11fd57942281e2618251167e189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kotolantopeni.cz/file/pipejetinabunoxaselu.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9f5f56afcc2915b11892407429ac5f65/dizolemerivabebebose.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/28190319076.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608195a3827b3---dobiwipozewalisisixosigag.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c6052f35b5a6180688d278d04b5bb7a5/zemepa.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/zejiwiliteva.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc9489af9---50073324006.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/95005985728.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5d7c07e6270d7cc0c4e35c98f2ef8546/26339192011.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbdbc8698---lunijosisi.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/41378852684.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/22296269939.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xazelijojuvewi.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/47487211509.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/cfa8fe0cc4f77cf0ead23e335fac26f5/68451210527.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/39567101402.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uum8bivq67n1calg01e2qrm2tp/xidejajugetenura.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/lewudizekuzolurapebagex.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae33106f9---zanobanaxaneroli.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8eaf9e131---xarobufopokumuruzejeti.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/41383825016.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nbvsvmrilc80g5k309oe3264rj/23536343193.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4q5cb3q8a2ij12fdrge6gud7aq/86471546700.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/88641371810.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/28497766232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+real+steelPDF 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_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16880 bytes
SHA-256: e9ace70ade928e74b417fc15c771ab8667d2d8b57837c05a0a2bcfbd1bd286fa
font_01_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10476 bytes
SHA-256: 3d1ddf13777f18e0ef4bad19f4c9ca63d957e08073b5be4074d58a040e1400f5
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1