Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdd82ff0284ba4e…

MALICIOUS

PDF

80.7 KB Created: 2021-07-02 01:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69fd25ab434b1f8bad25047cf8c2a98e SHA-1: f9e1b956c958b8e9372889c243b96e54427ed7f6 SHA-256: 4bdd82ff0284ba4e52930ca3fb6ba8bfb5ccfe5bb0525ea290d12994cfbef523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://atomleasing.ru/media/File/bululumunijapedetojupud.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/87002452859.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821af16beb2---merilazujofesil.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e6ff3745---palipipozalefubojajes.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ef18a0557fe99102f07df0cb897478f3/13458540455.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339d31c022---32575532249.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/s3f7qpuu8rkjt258nlatftqbb0/tuwawofozo.pdf
    • http://vistobrasil.net/uploads/file/14549478226.pdf
    • http://digitalpolicycouncil.com/imagenes/file/jepadakuruvekewe.pdf
    • http://westernmaki.com/uploads/files/62641643704.pdf
    • https://cengilli.com/icerik_images/file/kobasowananin.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af9d27e9b---41166654592.pdf
    • https://airbays.com/userfiles/file/lonevir.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3f779b8eaa7994924916b8b8e83922c3/palupivebegirap.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h9afhso3ouaq6n1n533nlosnt6/xatipilivit.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fcf89b92ac90ceb8190448204432c6d/zugulek.pdf
    • https://emauto.lv/index/images/up/file/xugipudetanevijukaneb.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/41021a59f09d57196bf05af202994b48/ralaferozovax.pdf
    • https://accu-split.com/userfiles/files/31342869072.pdf
    • http://alliance-ltd.com/userfiles/71634407234.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/f6jargre2u2bppl5o0217c7pi1/wijuwelegosevorikumixaro.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4046f159e323f8c5e3a4d7648c1375/20435746267.pdf
    • http://akcjonariusz.com/UserFiles/file/2737580998.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+add+blank+pages+in+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_off0000d738.bin
b240cd17b792e37fcb736bbf861e41c603d722de6e8378eb4fb9a4ca5ec3f5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 10884 bytes
font_01_sfnt_off0000f019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
font_02_sfnt_off0001082b.bin
8596d9c34f1313026cefd72ca7cef168e0cc37972587fb00a2bd2bb6685a6ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 17068 bytes