Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb66c504d4ff0ba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 01:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41d56580c7d18b8c31fe111e26e1eabc SHA-1: 055735f3f4625ff81e4dd9081dafc8788407594c SHA-256: cdb66c504d4ff0badb3a718057c915cc20190e16081af434d127626bad271f51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=street+fighter+android+app PDF link annotation
    • http://tokyosushilohaus.com/uploads/files/13147681449.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/telizugijojejubenajerazal.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/32639624256.pdfIn PDF document text
    • https://granitnet.hu/editor_up/panamevanolagesemolule.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dbini5jsinplruun2ai4iifpe3/91795359161.pdfIn PDF document text
    • http://lukinserv.hu/file/60658976822.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57021761212.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/27450480379.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/97723866040.pdfIn PDF document text
    • https://raljob.com/userfiles/file/59014097487.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/24315683617.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/sulejapusuvunodajipaseket.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vuborulisegadipu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/lalewotaleteperakunuki.pdfIn PDF document text
    • https://datawire.gr/files/files/javojasunise.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/82f02df56af98a4b243480988169e837/gonibapemijovoxonazi.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/nulakuxijusepajapusezeru.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1111ffafd29c60e73ad98498ea47ff2d/bosetiwin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc1e860b6---79616661837.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/fobabetizasubewivikop.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161409df80cd28---fazoteketozutivasadej.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210912062021_1083561575.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090819483312.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 10636 bytes
SHA-256: 544ca86ba662e8752c560b109bc38e6fb6308c61d12e5ed92e2887231faef870
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 18636 bytes
SHA-256: 1ea857e453cfb9cf40001f4b8e99242b8e3119fbd2d3705c8c2276563ba85a20

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