Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9906064d4e620c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 09:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0fb5d7a1f9b5567f6944b02f435fa97 SHA-1: db13c47aa25c05b214034e13d0edd591ad25d402 SHA-256: 1f9906064d4e620c97291ec440da6ba7754391d8cbccd65d2993bf7cb8848c73
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aadharshilaschool.org/userfiles/file/85511119898.pdf
    • https://piauiaqui.com/ckfinder/files/97474452430.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dumamibi.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/60916473469.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613034acd656a---sagekugezesoredimosilaf.pdf
    • http://utcsp.rustyramone.com/uploads/files/87279997245.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uvcr4oeklq2cvfpi3e3golo1qk/19863683525.pdf
    • http://massiimo.com/piceditor/file/sixabiketirapolixux.pdf
    • https://susta.vn/userfiles/file/82170282367.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/70389984350.pdf
    • http://vandientuchinhhang.com/upload/files/71495440215.pdf
    • https://hirurgija.me/files/17858851583.pdf
    • http://modra-skola.cz/userfiles/file/38978884545.pdf
    • https://kerryparsonsfoundation.org/media/file/59168292154.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6501daaa3f8dece94720ff8c26410694/vusakejokoj.pdf
    • http://bearings-home.com/userfiles/file/4194756422.pdf
    • http://jinanxintiandi.com/userfiles/files/xarakezuzoloponimi.pdf
    • https://nedimgame.com/calisma2/files/uploads/48168176226.pdf
    • http://www.agenbenangbandung.net/file/netipafusoxulafu.pdf
    • https://nevisnews.com/userfiles/42074471270.pdf
    • http://nature-revive.org/files/file/zixus.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/temuvukixepu.pdf
    • http://sakem.org/userfiles/files/xosasiwatedotonudazerer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+fan+games+ios
    • 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_off0000e755.bin
89ea6aa5bebbea53845f62582484b5705e06d6f813897138eea8ed2821371ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10404 bytes
font_01_sfnt_off0000feeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16792 bytes
font_02_sfnt_off000116fd.bin
5f3166d504e4fef25b90aecc9ba65c9e4680ef332f221d1161d89e6dbcc1bdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 18496 bytes

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