Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f06dedce4d8bf…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 18:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6add35b30fc990adf59c66801c4b115b SHA-1: bd390f67ab052ed2365734c7fd573475f6bdfaca SHA-256: 266f06dedce4d8bfd9503b4d3766c01b2f82f3932c4b9b7cf469cdbe55672622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of PDF link farms and the overall detection profile suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b3a5f77afff41c251cfb40b0b1ba16e/witalifobopufipijewalaxid.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/011e75d5f04f25f0fdefdb5e730f2f2c/33748381339.pdf
    • https://n-zvuk.ru/upload/file/60050609188.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3bno2v97mlitsb4pokqqaf6rfj/598080365.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/248b932e94e8e0433bce88c86ba093f1/69529223867.pdf
    • https://lapalettedesarts.fr/gestion/file/dunogerazojujo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20e98cf36---jebukaluzaran.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2428c512---jiviravisepubipi.pdf
    • https://aartipalette.com/userfiles/file/pesugit.pdf
    • http://studiobaliva.eu/userfiles/files/13555179854.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ede7219---korebudorugaputaxi.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2542dd4374e301b9a1cd57e81f4a3dac/zosepanajixaxutewoze.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8704c74cb0---82302718617.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c465ac4cc43fbd43aef0d7c8f67c99f1/bewop.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/332b201e6bc60f0b7e9e4566740f2fbe/bizugesulukozuxoninabova.pdf
    • http://omgmediatank.com/userfiles/files/wenipupat.pdf
    • https://securityguardsupply.org/php/uploads/file/kejamagema.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af79c5b7f---66302494606.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700e3f846---8452280283.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/73d8b06a857b0fe310ca0e5eb30c4725/82070876577.pdf
    • http://twxcd.com/img-aim/files/65265510997.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5b7291e0cc3782db2356a4db21850517/35542145197.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4930f75846e9b7bcc64e3b53a3e84c32/bogujofizegiboze.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4719ed362---melakosabenefofewu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3be501aed---nafajisos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=java+extract+text+from+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin
661bed405043c1447d9eb72352ac00caeb403ce1520ebe953d5b228bc7a39d89
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10528 bytes
font_01_sfnt_off00010254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16792 bytes
font_02_sfnt_off00011a66.bin
e56aebd0695fed80d7577b8f735c412feb9a515e86f6404aa853c064b12f1bda
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 18040 bytes