Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a56bb3be6529e4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 15:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0e9162159fa365c8800b7d5b4e094f9 SHA-1: de7fa46ce6cf83046b1d402c00aed2d8ddbb5b13 SHA-256: 67a56bb3be6529e4c04e9c477d75e7cf7ff6f2db0c8140e6b5033bb9ac7a0a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are flagged as part of a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://elegune.net/files/galeria/files/36032324896.pdf In PDF document text
    • https://netkat.in/ckfinder/userfiles/files/92231338785.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lu6io4cabqt4qhd0olqe6umlad/79650542675.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904143309.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/26817154416.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/42312646904.pdfIn PDF document text
    • http://terminsk.by/pics/files/xodewifivodotamenoteg.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/zewagumuworuv.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30363603185.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/53330119990.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/pumudupedozuxosapi.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/13197842308.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/13a3ed3e666af22f1f70cb9f7179f316/69073226511.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4e0173333550d6e96e3bcb988a0743ee/biposatokenimosiza.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/58888131775.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah76uad9nfeoolvdsjn65b9os6/pefubemonumowulumedaf.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vonakikud.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/6511390630.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903040328.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51a3360a---87597715824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=phone+settings+apkPDF link annotation
    • 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_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 21648 bytes
SHA-256: 43fb104a332b18aee6a881fe0835cef1e4b9d8a167a709f1d99b36aaf6bd90a6
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 10480 bytes
SHA-256: 98665d2e50b3cdade121b05ca126403aed27627e5df0a8183a37119611c2d725
font_02_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1