Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cf53ba785d3a8d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 03:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d5f4e955545a482ec12831474386f5c6 SHA-1: c39c678101cf631ca565e3afdd021579a4fe712a SHA-256: e2cf53ba785d3a8d23690623d79ee109b8bf0c98a96085da08c833caf4a66e40
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to compromised WordPress installations or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • 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://alpha-cp.com/userfiles/file/44373365948.pdf In PDF document text
    • http://ji-tien.com/userfiles/file/daberesivonofekin.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832db72ddd8---85584267004.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qkq90mu8m5srtun1257qq7uc1k/bulibeluzofiromojowefi.pdfIn PDF document text
    • http://billsky.ee/files/file/64658172143.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050101122711.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fijesulizopejofexepeb.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/73904128227.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f41691a9a---47399156402.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ec79edul6il8ol1jbu25s5071r/88332816924.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0433aa35---kawotedanu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074088898012---xanemoduvetewavorabemige.pdfIn PDF document text
    • http://oris-am.com/editor_up/62843805456.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/wugep.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/98454099311.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fb15696---nexemolorafamoxibizomiva.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/20810495447.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4e6e284123e40ce1a25feee2faacd1f6/niliratowo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/muvozosibedo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa423003d47---34133878764.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210709_AD47916B29D491AE.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160812b27c45bf---76235421006.pdfPDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0c174767185b89f60056a655790cc471/90484304795.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/55251734828.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/sitobemepekebutogenaf.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/figixilogawilimexokika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=will+may+might+predictions+exercises+pdfPDF 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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 11276 bytes
SHA-256: bbad0f88aaf1f359c790be28318e79f5754be21639ac06ea0e9eb9dde2ac4688
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 18644 bytes
SHA-256: 48fdc34abdc5d7403faeaf1da367160bde4cab7d16c5cadf4d80b58dc979fe11