Malicious PDF — malware analysis report

Static analysis result for SHA-256 3795169f71e1bfdb…

MALICIOUS

PDF

163.9 KB Created: 2021-09-02 10:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3aac221f5831030a17dfc98896dfb191 SHA-1: bc295146fe26fb3ba0160ce3e6857294665f0497 SHA-256: 3795169f71e1bfdb21a4699a2da1ca68136454bd6b8f363ffe53e8f5640cd13f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6dbaceba4002703a7e413d71c882f92a/23563324713.pdf In PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/defulemuvapalokemagejawu.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/nuwawipaserepajagiva.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/82859766111.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l28reuj064utrl4fk5vid79lv0/16631054588.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c864a58a9e4---46434708094.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea0114f42---98669799756.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kunenilutujijapitiruxi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kebekuwan.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/dukezorire.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7acdc2f6cc---xabexesegaredavipurafinir.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/e45o1tigd7cja3hcaolus89v55/4583613350.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/94797519716.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0fesaa3tj9dso8cpnv6v42mqi6/6619491257.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4oun0c5lt652hp0smvnad1prkf/lusupokotijigan.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9b48130ac3142ae479f19e2e31f633ba/wuzutuwevejelunovetubiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f8f5da94---xifiregudujebajunepeb.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210827170110.pdfIn PDF document text
    • http://traviet36.com/upload/files/puwifuxusoneb.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/94f5e8edcc187f7f04e2ee9a2caa3566/66239752579.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/89421619779.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9f6de57aa1d735184b6af0580aad3004/99266379117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=he+remembers+our+sins+no+morePDF 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_off000215f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215F1 10196 bytes
SHA-256: 933b83e69bca755bc35a3612917bf4e9fe0b97b141a99856190642252d396e1e
font_01_sfnt_off00022cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000244cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244CB 24616 bytes
SHA-256: 251f1819617d3af92f64cd76ed205700afe13ee68e897ee7387d692d4fba8120

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