Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33945b01ae9836…

MALICIOUS

PDF

96.0 KB Created: 2021-08-16 13:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dc3635dd0c6f304f880be738481ace9 SHA-1: f68506b5691e7a4da1dbc44e03fe3dd0fa9e1553 SHA-256: ec33945b01ae98361629d5ac676b62fceddeb46eb130d10d8e4ce874749c7b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984cdd8cdfc---69172301025.pdf
    • https://btsis.com/upload/ckfinder/files/4760709704.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d73042f52---98285743135.pdf
    • http://mixmarketing.vn/upload/fck/file/7020051098.pdf
    • http://biemmecommerciale.eu/userfiles/files/33296574407.pdf
    • https://thaiwoodengames.com/files/upload/files/zujulixejakuzulejugi.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0da235bb---6505492442.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35e141c68---memenoxasisakuli.pdf
    • http://elskup.pl/images/assets/file/60857887033.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/402fbb7bd6201cf5fded90e4b316784a/51447890480.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/23901078782.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/famezesofi.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105271e75201---mixilurapeb.pdf
    • https://honghow.com/ckfinder/userfiles/files/84873323776.pdf
    • http://video-cycling.de/files/file/47633990172.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/528ac319cca0470018dc8da7dba35bb3/65596299434.pdf
    • https://badrivishal.com/media/57194952895.pdf
    • https://golf-tout-terrain.com/publish/page/file/lowumobuzelowaxusiluwoko.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/xezaxoxatisen.pdf
    • https://appvid.eus/userfiles/files/89449173425.pdf
    • https://seedomoretravel.com/files/files/12180720383.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca1841a14d09a589b4786ea6b6ff5e2b/dupimufeliwaroniwi.pdf
    • http://svazekobciorlice.cz/userfiles/file/vixexuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+play+go+fish+on+zoom
    • 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_off0000f4d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
font_01_sfnt_off00010ce7.bin
243d0f3eb84e8a8542d729496c53289605444c22395d505b485a1ec7c324505e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 19100 bytes
font_02_sfnt_off000127c8.bin
19decc2d5398f042fb662671cdecb54cbbc7183bf6a4134003770070e2c9fb42
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 17696 bytes
font_03_sfnt_off000155d6.bin
9dc3feb70a8be58e7ac495661da34cb77b51111a79987cfaf4c1dec5499eedf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x155D6 10964 bytes