Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e7dab4d1d548b5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21d52c9484f98c2cc872845c0bb1e480 SHA-1: 5ba2c455ffbab8e68699a39d810caf260ac6af7b SHA-256: e4e7dab4d1d548b565d04e6eadb2607ebb977d21b6f069e4f04cdc4eb97fdc57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=solving+multi+step+equations+with+decimals PDF link annotation
    • http://marketingnews.fr/images/file/36603771811.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/79047598.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/lorixanoxupi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e574451367cc705effc83774129c294/78017111374.pdfIn PDF document text
    • http://cloverdiamond.com/file/fopulejodeb.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/lufarolelawavowufebi.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/momenisiren.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/jatetudamenupurose.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5c2dc5c---kidasizobivezuxinusado.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/wupoliwixexexajalepuzepo.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tufaxesolevikopu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1df513b9---8103646165.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/titerenakazilawigijimon.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/91072501340.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/76061267818.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/finatotojumuv.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8a528cdfd64c1714574d9f32c69ee175/kosefutolofagabej.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/79549539413.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/a3pfkod9sehlbg8odgnsmasts0/zerijuzas.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/zesilu.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///xinudafijisikikituk.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/143334727614e6029824f6.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/65337393563.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/25634581039.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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 11332 bytes
SHA-256: b6657ed12c4d771d626849b41910a45818e9ad3aa38aa886b723d192c3ab36ef
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16812 bytes
SHA-256: 3261ad5d95a0764494008f3a5652b23f70849283a26b93c3370c1afc20daee20

Open this report in the interactive analyzer, or submit your own file for analysis.