Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff89b9e0bdcddb5c…

MALICIOUS

PDF

84.2 KB Created: 2021-08-02 07:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd84edf612518c96df0478dd4f35bd13 SHA-1: 3d00d9ab73fd4d2ff648b3670a96a43f7d696f9d SHA-256: ff89b9e0bdcddb5c843fe8a0cdaa9ee00c6baef2cbbc0e6227c749e811cd2f62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm and compromised CMS uploads points towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sibois.eu/userfiles/file/80258974659.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7485e7692c---31631967472.pdf
    • http://xedaptap.net/userfiles/file/38843570035.pdf
    • http://esoftland.com/userfiles/file/forogefatiba.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84698b752b---70271004350.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720821b214c---62806332858.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd63797358---9170166282.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610344c0bc560---biwoxuj.pdf
    • https://mosallaesf.ir/uploads/ck/files/jabepawimeduvarijixe.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ad1f0752---78943605982.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/896335b57c4425484a4b1f11fa19114e/nuretaxevopudunisume.pdf
    • http://foodchemsino.com/d/files/79392014289.pdf
    • http://toshiba-center.ru/uploads/files/petaxapalufiletaz.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/064b788d284a6b2af836f394fe721114/kibevuziwefi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a43b7b1f2---fejemudijedupupadureziw.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/livinutonawuwituwaragidoj.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/1613687211.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/satanojiz.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/74988434127.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b499225b08663da8a518fdc5e9f208d2/59406178609.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fundamentals+of+management+decenzo+agarwal+bhattacharya+robbins
    • 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_off0000e375.bin
816245545b9745ad388873d1778d3fc7a85666b887be0bfabacc499fb62ed32d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16864 bytes
font_01_sfnt_off00010fa3.bin
d593473b8c617f7b6c0d0c307f7ae323ee0de53899d56b872c02cbc1452045fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 11400 bytes
font_02_sfnt_off00012a3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 16792 bytes