Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd19379ff0f92d1…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 01:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0006db410cb2dc4ead056020aea21707 SHA-1: 022793b21dd32fe6f489a1051836a5e5d4184a9f SHA-256: 8cd19379ff0f92d1cb25580bdae2efccbe03278f493625099621445592acf4d4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links indicates a likely attempt to lead the user to a phishing or malware distribution page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://2ruoteexpo.it/ckfinder/userfiles/files/jerubatiletadoniw.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/95089813055.pdf
    • http://csc025.com/userfiles/file/20210920044409_7zfhnf.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/madibexejug.pdf
    • http://changjiujz.com/uploads/files/202110010153374612.pdf
    • http://lapenya.cat/imgjovesnaves/file/refezurozilofizaso.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/13628cb28892525d840df13dfdb16366/49689336508.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6f380256---88332379484.pdf
    • http://gruppocreta.com/userfiles/files/sivowekazepake.pdf
    • https://endeligmandag.no/e-brev/data/div/96421668353.pdf
    • http://excellent-art.com/userfiles/fibojowafowew.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/wafupileluviba.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/1597636543.pdf
    • https://qpshouse.com/upload/image/file/butisinu.pdf
    • http://malovanesklomh.cz/images/file/16941422603.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438d4f851a8---patepovotilitesiwabatisis.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/7296189609.pdf
    • http://poltinka.ru/userfiles/file/rinilajuniraru.pdf
    • https://armenia4d.com/contents/files/65307331405.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16154135c86d8f---xigiwixisuw.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d680a2fa---zujapesebeta.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4qonh78ej9eje0kuo6gujrbvi0/6702867981.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=conservation+and+management+of+water+resources+in+jammu+and+kashmir
    • 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_off0000adea.bin
73a06496b5ccc7a2817cfab2189325742675d4c2976acde8314a0d1678cd7a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 14168 bytes
font_01_sfnt_off0000d152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16792 bytes
font_02_sfnt_off0000e969.bin
c1a9e5328ffb18def0e4ae2f33d2ba026a0a74b0bc3cf9a370b0f7f1059b3258
pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 11384 bytes