Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa0d3731942b1ee…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 17:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdca2fdf8b6f99a5c80fc09598213737 SHA-1: 77618f9d01f323a473b85ee465abeef7199af96d SHA-256: 2fa0d3731942b1eeb73d92defdee6de9142315bb111f9f5701e3d3db6e1938a3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple heuristics indicating it is a link farm on disposable hosting, potentially a compromised CMS upload, and uses an advance-fee scam lure. The ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=best+tune+for+mustang+on+no+limit+drag+racing
    • http://7seapharmtech.com/Uploadfiles/files/kekezobavefeduxofexu.pdf
    • https://penzionradvanice.cz/res/file/44008591939.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/gebetijopuxepuzufupa.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/76803255189.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/89602138738.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/7156820442.pdf
    • http://cansuyu.org/resimler/files/57655500469.pdf
    • http://infrabud.eu/fckpliki/file/tazavulabebilate.pdf
    • https://zweefvlieg.net/userfiles/file/82453220455.pdf
    • http://gioiacompany.net/images/upload/file/nowelutofagasupulineru.pdf
    • http://flex-link.cn/uploadfiles/files/54204154525.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32358c617---lenepive.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/resuvonaziso.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/viwatevudunoxusifoxet.pdf
    • http://kxqcgs.net/filespath/files/20210914183134.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147fa510a1---1114071473.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ibsa3dmkb4mthqc3khlm8nk0jk/lokuxeruxawunexetak.pdf
    • http://www.ecvbrass.ch/user/web/file/fodusuxisupuwefadewox.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba98a2597d---81184825542.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24730582985.pdf
    • http://wwm-quanta.com/upload/files/mexum.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3a284f55---42895264858.pdf
    • http://creativetechno.in/userfiles/file/45312924389.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315effac24a---ragokebalu.pdf
    • http://fazekaskozpont.hu/images/upload/file/99781680618.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/13036350302.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/84t5p712c0apptqcij533nlktu/vedipedefefoni.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_off0000e543.bin
f39c761ddd291cef860dc8cbb8918e72dafa6bbc6bc8567f07723e11c0a4f3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10972 bytes
font_01_sfnt_off0000fe8a.bin
dd42ec813c06acb2f1f4bd2f293867bf1544c6417ef6441016170a65c35edab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 17580 bytes
font_02_sfnt_off00012c96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16792 bytes

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