Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb711e8f76a76274…

MALICIOUS

PDF

90.4 KB Created: 2021-08-02 01:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 6ee4db2a94a9f8b22d499b4167481c9c SHA-1: 4394d42525a7f583ac0fed1ff9585a0e2f156d54 SHA-256: fb711e8f76a762748705777cfd9d5bc722e2933d5246603d5c8d8be783ef0384
216 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing a link farm and a lure for browser extension installation. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting suggests an attempt to distribute further malicious content or phishing pages. No scripts were extracted, but the overall pattern points to a social engineering attack designed to trick users into executing malicious code or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8fe3d793---66036372725.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/658f1530a0d57aacf61c562f7d1e3764/37998486956.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/vikijiwiwexipejisi.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/61493776186.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2nts789ndfvj9cqomfe4cujd78/gafalusesi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/papajorafepabujo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da20ece3a0---62878841631.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wofajimiboduda.pdfIn PDF document text
    • http://dzbnf.com/upload/file///24077133346.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/22086084355.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/5hppouah582ajbo4rdqahv03lq/61853887931.pdfIn PDF document text
    • http://k1a.ru/images/files/file/21981046359.pdfIn PDF document text
    • http://tai-group.com/upload/files/45309327274.pdfIn PDF document text
    • http://kco.su/userfiles/file/19965735876.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/46287226092.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/992c1c7dfc104482de8b40219978a130/lamalijelumopotovod.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d37970c73---36476792043.pdfPDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c285acc0ab---70054943728.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/30208548207.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ql18tr5b54tfeqr8f6rhr1qgi3/41032092856.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/32433090047.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/111026416467.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/97385942094.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b3e396ed7c26759e28f8f9ef3909d86e/8143262774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adverbial+phrases+worksheets+with+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10852 bytes
SHA-256: 9213e6f353c93b49b872d0c4eda0b2c27f3750e1f388ce78dec99c76dd4a59bc
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 17580 bytes
SHA-256: 0530c5ff91ea68a97f3082395c213081c59c94650fcd861ff828943d7fff5186
font_02_sfnt_off00014212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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