Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2cc46c2a002602…

MALICIOUS

PDF

74.4 KB Created: 2021-09-26 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04e422730ab91bdf54af2a963605fdf2 SHA-1: 56f7d6a96a9a06de63c847762c3ded932006ff6e SHA-256: fd2cc46c2a002602612953e6dd3d513ea4be270d53db0816342777aa9dbf8fe4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The presence of multiple PDF link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/28655576289.pdf In PDF document text
    • http://c-amc.com/upload/files/donelonopisuzixomawa.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/rivisu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/88736859463.pdfIn PDF document text
    • https://onecre.com/images/content/files/sapuvotujelajudedunezupim.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/90478097362.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/nujinonawewizilolojobajib.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/mixefebixobosamubamixuxet.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348cd3ecf20---kogelumasiken.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cr52sjnh5157hdd2nrjej5mmt8/66341226516.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/5757020276.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nilekelizemipud.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/wujivivisegedi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/66217340845.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dowirogegonos.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/25242122907.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/17539883631.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7b93ac1f---37010822290.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/78752291527.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/94748616920.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd09dae77d---97487437642.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161369c7dae03e---64517671353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vpn+project+in+java+with+source+codePDF 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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 19780 bytes
SHA-256: bdb9c9baf524596d413e66fb9190ad3b89a9655ba1c1fbed874194ce247b86cc
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10916 bytes
SHA-256: 687c86ac2b0748250693a12b057c492ee071718ef1ec5ca9adf8de5271a72e36

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