Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bf91cb2dffef6c…

MALICIOUS

PDF

105.0 KB Created: 2021-06-13 11:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 446bf5023da7440713e7721f2b09c0c4 SHA-1: 03fe8f4fd6ff689b663ab705555c4ce5805a7e58 SHA-256: 59bf91cb2dffef6ca7a7e7115ee1edf4c7eb0ac75b4ad1c26335852091e3fbb0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document functions as a password-protected archive lure, instructing the user to download an archive, likely containing malware. The embedded URLs and the heuristic firings indicate a phishing attempt disguised as a game emulator download. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=pokemon+sword+pc+emulator+download PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6fd1d9cb---55843377192.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zavagufik.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5730d561a8bb5e8838365a68bbc26ae/74876998439.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/52673341491.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fovufe.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jumalalogolafevojokizepum.pdfIn PDF document text
    • http://mp-journal.com/media/file/fewemarogefikitarulipok.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/159626022860a5f7995fd8e.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/79596580857.pdfIn PDF document text
    • http://thedreams.cz/files/devibuzedob.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/fb35d8b11b3f29e938f4e6d78044deff/39088448247.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad86e9233d8---59560630453.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/49533531455.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2dab79d0---67065346701.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d266154dfe7d68298b9f4015fa578062/3213957978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 2912 bytes
SHA-256: 1dc4d53cc543180180c31573cc7ff31d5166e80dfe0f7d334e321c19e224dfc4
font_01_sfnt_off000155b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B0 5376 bytes
SHA-256: 624752b1f6947b1f5022e04662b39bf326df9b5668f0fce2f4f471eb105b720b
font_02_sfnt_off000167f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F8 13444 bytes
SHA-256: a31a2196d371d889c5bcf6268041f16e2df70ca98b68d40f89bfb382d9d1a030