Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a91b57082aa884…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 18:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dab718992b654887f4d7432351dd3824 SHA-1: b690ce27d11f53d5586097ce41d6420b9ab7a873 SHA-256: 82a91b57082aa8843efcfee23007070b918bebec64411e29c6bf42d1bc508747
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically a remote-support tool pretext. The document body is heavily obfuscated, but heuristic analysis indicates it contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were directly extracted, the overall structure and URL patterns are consistent with malware delivery or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://allytemp.ru/uplcv?utm_term=billu+barber+123movies PDF link annotation
    • http://hyunsin.net/userfiles/file/83929798655.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139e04895785---19478675805.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/53795185861.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/78213181195.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/22630422405.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/40662152042.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161326b07598d7---vajeguwadugabelitazoju.pdfIn PDF document text
    • https://tavio.ru/files/file/26540474356.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8275e8de8912acf0c5cfd1e911dbfd3f/pedot.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/fijefazugitovededobe.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/nerosufekawalizopifuwa.pdfIn PDF document text
    • https://filetorme.com/upload/files/42059373583.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e4f3aa636c9e193c898458f7e2da14c0/debitexemide.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nufaxujesipojob.pdfIn PDF document text
    • http://tradotel-riviera.com/file/25542866877.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1232e0047---71255653839.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/xofefolubavuti.pdfIn PDF document text
    • https://funbugs.ie/files/file/13962609658.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/58547260942.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/57540431460.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupekafagadi.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/fekedonapasakonixomix.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/45891557523.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/28620361271.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/48611f91958214c4c638c80b339dd4fa/pegakiniwoditi.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/vuxuxiwudejumepid.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/43663354136.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_off0000b4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 17992 bytes
SHA-256: b5e452012ae3027e377b5998d1c3af7a2c26ed57a5813fbade283d487f443e9e
font_02_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10768 bytes
SHA-256: 611d4b09e1ee768343a51e21b7ca19d7264c6a4dd1f2799231b8e3c3163a7747

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