Malicious PDF — malware analysis report

Static analysis result for SHA-256 02242b88279936c7…

MALICIOUS

PDF

92.5 KB Created: 2021-07-02 22:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e932584a10ffcc659d364cee59797666 SHA-1: 6c961e03a2996fa9c9bec474bedfb80e1a8bf014 SHA-256: 02242b88279936c716c80d668757276dae2bc98309fcecea5b389a4934aa5c50
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://diphong.com/uploads/tomuxulipivope.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de14207ba89---rabifozixazenevigujutax.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88576217296.pdf
    • https://pezenasenchantee.fr/userfiles/file/35015059105.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9df88f71---tuduwofesixeguzozig.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1c06723a279e36f8edd704ef288f0896/81536513857.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a4l1eutalhp27ln9t0p74tiia3/toxajexufubomi.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607182e2cab14---77207418481.pdf
    • http://travelci.ru/ckfinder/userfiles/files/sebovude.pdf
    • http://ibconsulting.it/userfiles/files/mebodularoraxoveku.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/14760279509.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/787e39558a91837344ebac8d12283b15/surofulofegivep.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/oe3t8va8kiipjgvnf51b1h108u/77405632017.pdf
    • http://nhadephoanhao.vn/upload/ckupload/files/14624692699.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077cff1cd55f---83226342541.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a11495040c6---34222452818.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/95e2uac3o07ib4vmfovl6bdrh0/xowiserevukunemevisuf.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfd7b9aa2---sidebubivegedejapemivepa.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b30eab7c94a---22173803638.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/04hdhrjct0mv16ptptgrj474r1/771378733.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160928a81d76e5---vavopeki.pdf
    • http://stylowa-pss.pl/userfiles/file/tunefotaw.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf714fc34---lexemekosewimuw.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rkkt4pk6jqenpl4la5h1f6fgnm/tanabukagegukibepu.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e70177b---zesolelidema.pdf
    • https://rivaflo-south.in/userfiles/files/gunaxubaxadewati.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=living+in+tiverton
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
font_01_sfnt_off00010bf7.bin
db8984f8cedacffd8ee18fe36248fa670f4d15bd91a9f9c85689c1bd5be67246
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 9928 bytes
font_02_sfnt_off000121fd.bin
137c8f61544ae304aaea8894d92971cd30f0ac76c237efbc4dc71ceafa6a4857
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16844 bytes
font_03_sfnt_off00014d8c.bin
93b6cb5b3ff754c0f244cdb52e77543719237a2217f0a6eba40708eb76109f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8C 16620 bytes