Malicious PDF — malware analysis report

Static analysis result for SHA-256 983e68d873bc7597…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 05:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a48329786d1f50667e4fe9bf1de50d2 SHA-1: f3a6a89918963d070bbff7712e46d4f72895ad6c SHA-256: 983e68d873bc7597b70e5e7961c72d044be0cb7979b009ad5e5ba4ee8cc68501
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to a password-protected archive, a common lure to bypass gateway security. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=telecharger+cours+gestion+des+ressources+humaines+pdf PDF link annotation
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/10683ff8cda9d60a475fe74d4a8d703c/tipudalokinesogube.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/33033026383.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/donawamupukugutosigugitum.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/8774771635.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/80915875455.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e28d3a41c1509b065a3e963b9daef80/dewewalitubavinuvazili.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/36277885275.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff9e36494---wewekizoxa.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/vepizoremolebosije.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/lofagomemukomolabopus.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gq3a6dkrds5c07jvaarcoo75qj/piketajisigerupuno.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469e629ea9---faxekozatiw.pdfIn PDF document text
    • https://alutat.com/data/file/63146149322.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaec0ec2d0---buzodezunizojubewexul.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/t1e1mppq21fs8bt3ihrct3oh0s/74349020679.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/c115l2go1om8pjs0ie2v1sq51e/fovaguwise.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/45ce0f1e2e4989cc802fc558b5c24da3/xulujajigazakibopuzurut.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e33614ebf---ginosajapemolunas.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/57359773115.pdfIn PDF document text
    • http://manu-transport.com/documents/file/sabubivopo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/q0ukggvqq8f5atiiqfeglkeu04/99204682114.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b436d6f2136---1765381199.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/jaxokar.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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 11132 bytes
SHA-256: bbc8a56bc4f7f9e5d4aec237b43f72da1e759b0d20bbb203172f7ac8472ea0f2
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 19848 bytes
SHA-256: 464a416cd1aa637c965dc622f09ff1a06c8f8dffec4c21c4cd309ed42a5146b2
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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