Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c45df0ec19d744…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 16:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45f65202a0b40a93a5c3d357de0ddf21 SHA-1: 4f086698d4491172984f0df9126eee91bab6c7e8 SHA-256: 17c45df0ec19d744d4db8648f5a1ca52e78847451e22f5b0dd575c17403613c5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads. This suggests the document is likely a lure for phishing or to distribute further malware. No scripts were extracted, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d88730ed3e7b8fadf7db906cdc5dd85/12276913212.pdf In PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/wenisoduriferud.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/51158984988.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/panafupasimimonajetap.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/29718691311.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f1ce4e1a1f80adca3ce37680a166a916/1451894179.pdfIn PDF document text
    • http://plncse.hu/php_data/file/50130784701.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2aeac80876bf2c262df00bbba50053c9/mogobuvupizakusovi.pdfIn PDF document text
    • http://unityproductions.com/upload/files/sukumopedegom.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///40909687945.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jibimapawedirisabevizofat.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58dfde0e3c---lubefa.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pazaloxe.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/gudilajepi.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/55776290028.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5360a313a0766e29f7ed40a599fcb967/11818926646.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83812d38ac9f0d6e35e305d77c6ca465/pasopomakewusezumonulot.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/61318036269.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/jugifolozotoxuriv.pdfIn PDF document text
    • https://aneri12.cz/res/file/gopawusodokijevaf.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vifuxu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/o76169mlflm81snjfrv7maoik5/24495878413.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/rivuvasuken.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db5deee31---gofitawavonezunomade.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/jomizeluraxorepevevux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=3d+shapes+nets+worksheets+pdfPDF 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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 10712 bytes
SHA-256: 8e5edf6f86e89dbd49dc18eac7b0d97505d805ee9b2f25798d38ea24a051a097
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 17640 bytes
SHA-256: 9e5fd9999b83762559265ea0af7615c265bf71daefa8156a97eedfcce3880c35

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