Malicious PDF — malware analysis report

Static analysis result for SHA-256 79deca11f45f2372…

MALICIOUS

PDF

88.9 KB Created: 2021-08-04 12:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2b74732ce2cfc0defb37f7da5193421a SHA-1: e2e1968aa8776bead40c5ae3425e6996ea2a6a4d SHA-256: 79deca11f45f2372c93b296a26aafe121350d5d2be7e042260a910fd4c4b6e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=how+is+blister+packaging+made+step+by+step PDF link annotation
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/592ac4fbf3f52126493d5c1f191f00c0/52186237397.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zakiziwex.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609695dc3da88---rilorovafed.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zomologa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae74932e1f---giribazutebalovilemilowe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc2a49755---doxugoporo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c33effab5f3---68762383653.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f256b7bc5f---80644186599.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/42070087896.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/6805408593.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/63c8264ff2c8bd1209b623ef66642a09/lunumitagenalanarufumabux.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60c107870---sumasorivagulujizotuxo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b68af9a6fd8ed1e277743cc016937b1d/83350829209.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d255df096---11030356523.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/zosefefikafijupawipo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/24203911345.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/70683251808.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608360b5eb41f---fefiwi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb1b73986b---77707128254.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/57630648920.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bbvidnk9i7k25ktk827hp7o7ga/34520663461.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/858308943.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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 11280 bytes
SHA-256: 09a2010911a81e84e3cdaa56708b780fe235fbd3691c4a65e2da91081bcefbb4
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 18624 bytes
SHA-256: 8645d1385802c436b942bb34832769f4c7dd57788d8c4284b5f4cbabfe1f4370
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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