Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce703b94cf18fc42…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 14:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35634aa39a3532021f9c79d377290049 SHA-1: fc60ba730505967c8dc0aa49d894e4900908e389 SHA-256: ce703b94cf18fc425ba8e887106ab2b67634679d2363494d61efa37f9c9704d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://5a.ro/ckfinder/userfiles/files/61708374602.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u6cuquij69lgih1aen1610mj3/82718412205.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/99713770275.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/79914103111.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/54125003926.pdfIn PDF document text
    • http://vit-physio.de/file/3011816054.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/jojolamapajakexi.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/foridipogibakujuzamenuvav.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/46372884914.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rakorarofet.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/sizivavejadomipi.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/fasifosilukegusuwaxuxifew.pdfIn PDF document text
    • http://anyimaker.com/upload/users/files/robirosako.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/66929582892.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/vuwevotapusulik.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3222c881---36863880218.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e231117cc5---64632148691.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/48113378625.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/kofuronijifunaxelojowe.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15189295369.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/boxofelujige.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/08vqus8he8hv37p5maa59da1qe/xafenevix.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20480254652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=super+mario+games+free+download+for+pc+windows+10+64+bitPDF 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_off0000b8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 11784 bytes
SHA-256: 359036261e7718ad6a21673c4d34709928dd383d0dbe77fcf3f5f5f48e4b4399
font_02_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 15748 bytes
SHA-256: 29e8a7b482914b2d50f07005e22c46185759b8aa4c1b3772de8b286da3715323

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