Malicious PDF — malware analysis report

Static analysis result for SHA-256 c868ad7cbaff264f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 13:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d8d3b9204b0327a5c6ab4c7b11827e4 SHA-1: 3a8439677659df3143c35b4397f395546cc356c0 SHA-256: c868ad7cbaff264f3c349c814b5e63b1840b71d36f0bdf1570844ab583d2da56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute malicious files or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://yuha.be/_files/file/tidavufoxim.pdf
    • http://pekbdt.com/filespath/files/20210927141232.pdf
    • http://phukhoabacninh.com/images/files/91299760811.pdf
    • http://asupuro.com/user_data/image/file/xuvusojomin.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615114410a844---zavemamonagewivaman.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3da477a9f---kepamexesivamedeted.pdf
    • http://sisparts.pl/zdjecia/fck/file/92541257122.pdf
    • http://gemcom.org/userfiles/file/21104374265.pdf
    • https://bongkartuantakur.com/contents/files/40510710869.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8f98eb88---vumaranix.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/77011480538.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614099d151bc5---topona.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/58346761952.pdf
    • http://poetische-malerei.de/web/editor/files/28846141873.pdf
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/gavarikevolitutofebukas.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/17659399096.pdf
    • http://fgosvo.ru/files/files/gikituwuzudedetaxudaxiba.pdf
    • https://planet-pvc.com/upload/files/zonezegogiwufulu.pdf
    • http://libron.pl/fckupload/assets/file/19963188208.pdf
    • http://deshdunya.com/blogimage/file/jemoxitaxifisutaraguzatag.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/zomitujawi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=miui+music+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 16792 bytes
font_01_sfnt_off0000ca50.bin
63ddc1be1cd595d21d4a6441b87d21c0ba8c64653291700c167229d0d5b62a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16508 bytes
font_02_sfnt_off0000f461.bin
a9c619795e943c8badf0d3e32f2738119ea11bbd63384ee69b01e94c8194af24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10616 bytes

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