Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bb7e5c671af99a…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 01:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90ced0b56174b458520a3c3c8d04dec1 SHA-1: aa0634446c95896af5899f74fffba526872469b1 SHA-256: 65bb7e5c671af99a890ca5fec76644195d47e535331d94c688bd508021ec4a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=places+in+andaman
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/glvt64fu1u263g34cfe6m46me4/zerirutesowisobezuvepu.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aded5cd5e---90273069905.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/39763707422.pdf
    • http://martom24.pl/martom/userfiles/file/8590334163.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/napelofarikukopavulid.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160726c629807f---xefonadikasebud.pdf
    • http://ubest.ru/images/file/27632305853.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pedhnhjrn87n8ieee6sgg4fgng/kemuriwebokabawokinad.pdf
    • http://allamericannursing.com/userfiles/file/70820185520.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ced4493e174e704e84cf26ffd250a158/98749889987.pdf
    • https://radmangroup-ye.com/rgfiles/file/4826410821.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/fesuvirigonuwemalukaj.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca0893ad1---42116148327.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38bf12e6759ade57bcb6d568ce8e9297/vegepako.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cca78b81---82575092053.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2q9l025a1e7hpnjeb214rsipj/tuwox.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897239da64b---pimavemadadipusomanudag.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a266d0f9781cfbc7419d8a7aa6e81793/waxefozadevegakujataro.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/32p99n3fi85qkge50lrb7jr5df/34072423328.pdf
    • http://loscogliodifavignana.it/userfiles/files/gegojit.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/68434221549.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/20383811116.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/74981851362.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jjpe8o28enqlqrql6lr2cf4f54/59990140336.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_off0000f138.bin
08439c89663270ae0b5d69ed89a2a8172dce2796f58b46dd428c286ac6663381
pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10216 bytes
font_01_sfnt_off00010806.bin
a4d480570addbb374112e2188447bd8368439aa5a68b91567ef201319ca7bb31
pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 16792 bytes
font_02_sfnt_off00013375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 16792 bytes