Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b56a0a6725b995…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 08:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4d17fdda1289101239cab53cee8403 SHA-1: 0897babbe8f38f8c68d0252d925260db7ca4a796 SHA-256: 90b56a0a6725b995e1e7a03bc43eb37ee91dd255c6a14227e9f05060e15b3eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cac343da---50688739178.pdf
    • http://daonshop.com/files/fckeditor/file/zerurelataj.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/babe536185c37d944897fdda7dae429e/64371692740.pdf
    • http://insuralead.com/userfiles/file/feneno.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b10c51bd2---wosawe.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/3011814079.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jfhph75lurkfq2qa6gsbahj0rb/98045039362.pdf
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/banonowaxegu.pdf
    • http://kartywspomnien.pl/uploads/assets/file/bapogajibomusuxuzugo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c116bd33c9---zagifekigib.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080255d70a1f---41232760824.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5323d68d6e---94090422466.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0756ea9ffb---sevujaturepiximifi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dc0bdbad0efb222d996df99e3b2ccd8e/14785921398.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67059f552---91543865354.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d7f7cf75afd44a055b6f145441f5e3bf/taxeson.pdf
    • http://dmhu.eu/uploads/uplib/file/siroj.pdf
    • http://hiro-seiko.com/upload/files/11110698318.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/fezusilufidurexurajafi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1d8bafa2---gatejasudud.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0ebvcisgd19cuut259feq5qnlj/vuvalilosil.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bba123f5a---rozawoxunisasaribilu.pdf
    • http://bakineshr.az/ckfinder/userfiles/files/26868471713.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbf5de9575---fefemowiwoji.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd3321b7c---43847413483.pdf
    • http://hrt-foto.hu/_user/file/57523823468.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=research+exposure+a+teacher%27s+edge+in+the+21st+century+pdf
    • 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_off0000ec67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 16792 bytes
font_01_sfnt_off00010479.bin
4928f927b089b3b98f1e5b74adb41daea481ff5003468da1e3d4ede84e3bde17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 19048 bytes
font_02_sfnt_off000135df.bin
a83ad2d72289ea0395b869ffb5c4397a17ddd2439d8412cfcc461035a3f78bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 11420 bytes

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