Malicious PDF — malware analysis report

Static analysis result for SHA-256 94651bc4af4c86c0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 14:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0af170bbc088fa30b58be014a6ecf44 SHA-1: b55c895ad79cc4e11d0bff8c0b24d77928edc2e3 SHA-256: 94651bc4af4c86c0b1f29d836dec79ecbf980d23bad5724cfafcaca88b390773
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of a link farm. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://tuttotop.com/userfiles/files/95283147093.pdf In PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/5691487357.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210903_033FD6CD4BFBACDF.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/givobosupaxaloxi.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/todosokuk.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203432025f---rukomixizob.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138400b071b3---38636441526.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/90174423977.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/74058526244.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/gajap.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/57466216155.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401768cc7b5---rabarifuwejofagivinu.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/68933479292.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/kujagafomudapukino.pdfIn PDF document text
    • https://congchung7.com/upload/file/nimopafofe.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/14616315499.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/namogibewikuwonapo.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59808450724.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/42437961986.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318038efb45---26569187466.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sutipewojomafi.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zasamifejemido.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wanesolaganimotovom.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vedudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=andy+android+emulator+download+for+windows+7PDF 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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 17344 bytes
SHA-256: 8b4d4ae8086ae9cf4136421622c830309cfb980a18311fb761277843a2bca076
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10844 bytes
SHA-256: 6dda6a283b7db3fb4a694d0af634bbf3813cad1eb78dd183d92eee8304a6cada
font_02_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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