Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f66db832c9f8f0c…

MALICIOUS

PDF

72.4 KB Created: 2021-06-01 16:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4a0538592b7ac531f26c477b4bef7a SHA-1: db581d4fe84c22ae6bd81e836eb49192c6c78f1a SHA-256: 9f66db832c9f8f0c89492dd58c6d8d50446c7c2ede1bbc29571b9d7a279b87ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The embedded URLs and the overall structure indicate an attempt to trick users into visiting malicious sites under the guise of providing download links for popular media.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=twilight+4+hindi+dubbed+movie+download+filmyzilla
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2589c3cc49bd2fe7cba1e42c1170932/nobasitiwebirodu.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wafekedudin.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3902685o1of6vs48vorhmv24c5/wifedapafu.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db76a8e4a8---50834365610.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/b7or2rce6313f9rf7r2t34o5ma/2364158300.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cb09583d---46366047731.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/19334150089.pdf
    • http://copy2d.com/ftp/image/file/moxazovirigowobasuket.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/u97qjnng2p7ebrgk1ovv0tcs54/29832799200.pdf
    • http://aeronautike.com/userfiles/file/kararomedijilun.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ciub8uepuuim1td5m56qfvaep2/222110893.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gk3ve28n8h85s4tds9stqa1uqq/6969180577.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad04723c3---6004293381.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ff68b1854597733d82807b7315e2ec9/56757877606.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11860994e---56245475661.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ev74lvr2vo807uav8jfbqupvjd/mejenipolafetulejiboju.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2921487887---64444500292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd79.bin
cc7f9d9bdf2d6b22d943052a499fcc3fc8967dc33a3bc7d8828d9b069585f8dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 5528 bytes
font_01_sfnt_off0000f050.bin
1635f04b64a2c53484f8c310d09ad12b51976eb5c8352e5abb4bd1c49d056aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10492 bytes