Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8cb383a4566e7b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-30 20:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f9bb4b3c78922589514f63d89cc5100 SHA-1: 4da0f1ad66836642634530660ac8e7fca066c488 SHA-256: 2a8cb383a4566e7b61e253b9f2ca81a33737beb2def849bab7e7683e1b5890e5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of multiple links on potentially compromised CMS uploads suggests an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://ruh-center.ru/userfiles/file/bojokinivusera.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69fd4d0d6a20a4ce71bd96030969e394/26206923637.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c5860eea3c9f8a2814863d014b80a576/96701761400.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082076c5477e---febuxujimidozorupodexezo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612671c1c6cb5---pomasarasodubirigovobotow.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b6781a21---91512557555.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zavaduguz.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91425c5e1---23465288907.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa14643dc---vifix.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/5f3a029f05e66470b95bc2b6752f8d3d/20075487908.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/53366445919.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/61854101957.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/zuniruzidajujujugazukalud.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c09e05d12---77964162224.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/96913261021.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/vifuka.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8i8aaudmse0fp62vqfgd17i435/67684097000.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098349ea5ddb---19433232149.pdfIn PDF document text
    • https://clubon.top/uploads/files/fesiwero.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5bac86730493a27c753e018c4014bc49/kiterupo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90316022e2---57115821647.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/segchoogarfshu9fd3g144g392/23551078260.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/sifodupagigedubelotawoner.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/077094bc5445ae3d6a324df7249aa2b2/molofozefone.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/17139116190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=right+of+subrogation+definitionPDF 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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10872 bytes
SHA-256: f50b1b262d662514ef5603570a8fbc8de6e0949e20d95c26065eb785741bbfb3
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 18216 bytes
SHA-256: 361ae019ec24c39d5f159094e9accb6e6927ac6a3bc9e7cbf0096d15d317d034
font_02_sfnt_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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