Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53a764e3887953…

MALICIOUS

PDF

79.9 KB Created: 2021-06-20 12:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9a129caa10ade744ceb97bd41eb74277 SHA-1: 2e2f5c059f76a6812c8e2d3d748ac7df7ff23cb7 SHA-256: 2c53a764e38879533b314ab3f4821aca6a95b714c70ce96ceffd087782e16122
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1071.001 Web Protocols

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malware or redirect users. The document body, though heavily obfuscated, appears to reference 'Gta vice city for android mobile free download', indicating a lure to trick users into downloading malicious content. The presence of a 'Remote-support tool lure' heuristic further suggests an attempt to trick users into installing potentially unwanted or malicious remote access software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://wastran.ru/uplcv?utm_term=gta+vice+city+for+android+mobile+free+download PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c380aca0---xuselifufefep.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4mnre4d72a8n9lngml20d6nnqq/67053004714.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/gavinenibila.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077be2178745---damamoturakivesomufok.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mexidufo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p7837lfvlli8nngvdckr5fv47b/zusulepuwes.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/bufudibez.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/89354716932.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/27533463857.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd08932f03---34372312205.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/13920913682.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/22126a25a7f040368c04d5fc4cc617a1/sewudufebudukafurenadanin.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v42jkibl2cnfm8m8r2rnbju55s/67045993422.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/19451031645.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e3d4012e---24989885123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5200 bytes
SHA-256: e2e50990b034d15af9bfe2f9146e17ccbad1362d17d9253c476a085b5eb30fe2
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10720 bytes
SHA-256: feb0d04d2f534e33728d92bcf97dafa5f57c9275c6a4618c7f26247049034669
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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