Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b1ec281bee107…

MALICIOUS

PDF

83.6 KB Created: 2021-10-08 07:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48f14504b38784b8e1932f936330a9c1 SHA-1: 5d6791ed77bef9bb515eefe3fe38310f39d5e877 SHA-256: df7b1ec281bee1071af98cb5632110fd05a95db15fdffe69b3b078f1b7c47dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links may be hosted on compromised content management systems, further increasing the risk. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=longest+and+strongest+bone+in+the+body PDF link annotation
    • https://kccegis.com/upfiles/content/file/20210918121635.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210915150452.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/zusojilexemorofuvetid.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/26816964077.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/megagivodovej.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/37829546345.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fiakrsan4mbkr99bgjpbccnl58/nifexosubizufosarogumajol.pdfIn PDF document text
    • https://e-room.co/userfiles/file/67892431651.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/83920693603.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/95346871909.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/09ef8a5f98ab5ccb9f4ed1be69fd1435/migevikudowosatipeluro.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/vunefujugupufak.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20211001_170307.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f66f98ad42fe199ca819a822283c7732/26598082045.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152cde04a0cb---84421604029.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/29814645221.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7bcec54c36ec4e40fd4dab81fdc29748/1983213522.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jogifazebalajulebabikida.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ronutul.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rosimapefibiweju.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/19666596843.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/86834941979.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158285af4137---22691033097.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/7857922862.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/31495143674.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/75207460327.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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 18248 bytes
SHA-256: e67aa4f8722e1f473267d18c8d08d50bfd7ccf865c0c0b027218ab9f6fe99b03
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 10692 bytes
SHA-256: 91fd002e78d896b11944d45b46e8addb13cd6952f5b4fc275a82dbdde621ce4a
font_02_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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