Malicious PDF — malware analysis report

Static analysis result for SHA-256 974cc2884c5a474b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 09:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c84864fe4687bafcfbf0e5380c50416 SHA-1: 8b79640b0e2aa3a4f6919bf5d169fc074b51aa0e SHA-256: 974cc2884c5a474bef77c23e7e1042265bf67ec1c1da7572d764950a36571dd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload storage, with multiple URLs pointing to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=free+download+camfrog+for+android PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f912a343---nabete.pdfIn PDF document text
    • http://rayer.cn/d/files/fizasaparabaxulogogibila.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zixitapixiripa.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/97894935707.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/xolobevonusizigivimanazif.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/toxinojiwilojototiv.pdfIn PDF document text
    • https://panoramabyty.cz/content/11224274433.pdfIn PDF document text
    • http://jainfarms.com/uploads/varujazofaginafujevabegak.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/78868475269.pdfIn PDF document text
    • https://binhvi.com/upload/files/28647188782.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/lowigefevajodebajen.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/71699607890.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/061ba32c0c38a7bd6b3cbd06241ac0a5/tapowonofaraga.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161301ee842f72---18883741712.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/20073236548.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/93538052067.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/17007fea8e088e9db094618ad72b90dd/98640980330.pdfIn PDF document text
    • http://wwsm-us.com/files/file/79959203732.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384fdd993b6---faxuzixudateludovubigefuw.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tokofelupidodonakodisotob.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobenowevobowasimopurewup.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/72923129982.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 14268 bytes
SHA-256: c6523a513e29be40bf2cb283be603625adc0c55a0eb2cda2b00983fa3220841e
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 10616 bytes
SHA-256: f2aeb1ce36c1d5428840f2d3199473ca477686243c16b5e6b0545872427fbd67