Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2de09ae942d347…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ad8c055f42a0c6e23c34252a8908f1c SHA-1: 1dedc88fccdd25544a4dd6da43d5363acc6af894 SHA-256: 3f2de09ae942d347d81e7f60e7a1f0380594cd4cb48aab7bcbd715a0cd9c909f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing infrastructure. The presence of external URIs and the nature of the URLs indicate an attempt to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://cructi.ru/uplcv?utm_term=usha+janome+allure+sewing+machine+manual+pdf PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/denime.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/kuxosovitubekop.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad4963820---jabixawawokalerelugasaf.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a612d812232---fikedamilawininuz.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/43762928240.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/41852757723.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/50007151800.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609092e03831f---96713023513.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/63384182943.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/77716301079.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/18207408525.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/edfcf91114bce6e6a714120c576a6bcf/52815857991.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mts78ceuqm1uscl9b1b7hicne5/34821496861.pdfIn PDF document text
    • http://maxbrio.kr/files/files/kilitanafowofufufiwetuv.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1ea87869470e3c26e074a73de24b8352/tidepuwudekezifaxorax.pdfIn PDF document text
    • http://gabortech.com/admin/file/29538097522.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/55724553165.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/nosaginexenamudapasemorab.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/05p07fskv19kcc7givo71d1dnr/zuvutonuvovoke.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/69019169361.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/10549953823.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/79399920382.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202108291825182183.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 16864 bytes
SHA-256: 24ca1a21b4abb96035506a2545109bbb3a898bb6d8c62f73004c5b8bb3f82964
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 11292 bytes
SHA-256: 27d8ff24eafe64e61fc51bb68819e797fda06bc1fb633d2337110632cce49309
font_03_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16900 bytes
SHA-256: fb76ba8433ab2ce9d3352e29d32d31148795b6c903b4f580291e09c7db85421f

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