Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f24b177251700c5…

MALICIOUS

PDF

88.6 KB Created: 2021-08-15 14:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d24bb153d85ddb26e507e42956919949 SHA-1: fe85f26aabe3d231fb1432b2ba81a34f7418b82e SHA-256: 9f24b177251700c5404909c23974bbe4a40a2f6b56b79acd3eaaac8b99262184
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution lure, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. The presence of multiple distinct hosts and disposable hosting suggests an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=vivaldi+four+seasons+summer+sheet+music+pdf PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769236381f7---ratemawebizud.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/jabimigipoxesezanuxoga.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16f6c27c9---55876231849.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/67506999675.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73e7c7e55e---30948469625.pdfIn PDF document text
    • http://primaneighbors.com/userimages/35664859198.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/62b90ef5f8aa66187e4c8e0e126f4f02/68663872586.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aae552b66---togaguw.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/12599221956.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5lkcamg1q3n05ac61pn47afv1/nulilobagisanuta.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/jogapenopozisugajegepuwu.pdfIn PDF document text
    • http://changecn.net/ckupload/files/30603363814.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210814182925_o9na4g.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/sidilekajufulenelov.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df73f3f5cb---86644775142.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd935cd53---53468879731.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d2d5446a---46870888560.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/onusfc3atfdglebhta722ulj62/xemidadi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/63452173017.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/46149678205.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/46122221264.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vegibuvuxamopikuwoxuzovu.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/mopatotof.pdfIn PDF document text
    • 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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17004 bytes
SHA-256: 4d0f743395aa69a05ee6c6022b9da1697a0fc543c39f66302bf48da337ec2cc1
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 11020 bytes
SHA-256: 81bfc518e5f2111bd3e5f3830affe60af9863f4973327e58820f6ebe05f677b9
font_02_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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