Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd558b57f3c6bc7…

MALICIOUS

PDF

72.1 KB Created: 2021-05-16 05:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aea14058e357a1bec2310ee6615510e SHA-1: 5fb401e89ba04c3bda5555b525ba39b4b8b1aee5 SHA-256: dfd558b57f3c6bc723d882777e2485333936c7487a6c2e3fac1d16901e20444a
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. While no scripts were extracted, the overall structure and URL distribution align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://angkoronetour.com/userfiles/file/dofowewuvedona.pdf
    • http://www.urbanwaterways.info/files/vovelezanixonixobofipipo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607779b6e2ea4---3508247227.pdf
    • http://agcslohian.com/userfiles/file/70446315980.pdf
    • https://betenagro.com/sites/default/files/file/73230818808.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609756cadbc3e---kuwelinuvimesi.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a346f751d9---ralinizaxet.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nbd1l491iij72oksbqkde3f1g3/91420545098.pdf
    • https://alakharia.com/public_html/userfiles/file/14615258529.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/802344da498164ab27c403e687ea477f/nuvin.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/tp3517f129etjq83359aqkb442/sizen.pdf
    • https://kede.org/userfiles/file/xekenukekofuribegek.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f331845bb5---92079648493.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d32da0a51ac0412c366d0d9d352f1c58/7093648989.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/ratewi.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f202dbc642d1510501df2f58389f70ff/47239772018.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c439f11e5---junubajuwivibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rhapsody+of+realities+august+2019+free+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e310.bin
7c429dab1d4d63ac5a54f158950e74d9980eaf68356950bd02ef7df9156e9f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 5896 bytes
font_01_sfnt_off0000f727.bin
231471d607b0e9b015232b6bda5fa7c4afbeb9a3902b0ca6003af87cf081477f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10424 bytes

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