Malicious PDF — malware analysis report

Static analysis result for SHA-256 758cf1ea791cb399…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 11:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ecb60116a00eb5d026eed7eac5ebf9b SHA-1: e76fe45e04cbed366efbc0ea157cf3d629734a9e SHA-256: 758cf1ea791cb3997d5837240e8b6219ef01ddbb46eea566376332d9ed75ebd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links aligns with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/87475008764.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1be89e31c---90943671678.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/67339751178.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b330355be---gufojalokosifevojulomeza.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tobuxofowolufil.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/70703172834.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/fabevopetaladejokuzu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/94221501501.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nizakovu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/523346cc4ba025609ec735c5939e962e/loxerixewunigol.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4a4e429e---viwuzelebopakofajuwep.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210626/file/16247346745794.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18485ac8a---dotazulamamovi.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210818061756.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/71842546430.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vozimibokogudajuxuw.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f1929475---losirobeluvopem.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/7296115959.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfbb002552---wamod.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xugosumevaxaxug.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fozezosotukejeg.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/1dd6e63a56983eb4d889676331815e16/66632340231.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05a6c9315---2920259189.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5dc1d177ac7767cea20f95645a7cd885/39862616126.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zopajokaditanedasa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073299f858f5---dezuwafemuwamuto.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxofotexewilajefijowulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=diffusionnisme+et+culturalisme+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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10884 bytes
SHA-256: e2ec116507b01aa3b40253f40ef33f7a85e7757d4aef4d8b5db9a2eca6d0bc60
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 20412 bytes
SHA-256: 73e45aa812ef09c4fa9335789431fb3d316eafda0deeaff4bf0e6bb01ef58248

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