Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdfb2d650f1df28…

MALICIOUS

PDF

215.3 KB Created: 2021-07-08 11:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 41eb79ce4a679069caeda3740d709609 SHA-1: 4618f63a584308a2314bd2eeedf9c7769a39a6d2 SHA-256: 3fdfb2d650f1df2874352592c4fb872b771611d0adb5bc50e5705171b8f2d2d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often implies JavaScript execution for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

Heuristics 5

  • 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.
  • 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.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079900ae6338---5003859258.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5165207ff53cf0ea17ac1b0060d5ae42/27174093309.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/33km5h3ts42ddas5jqn7f8jcgf/gumofusiwos.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/10597833394.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/76fuu9df65668p4a68si20eh42/fisasidupikos.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f507b202aac110a27cbfeec40be45c2f/77695037392.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d604ca752aa6a799d5176c3c0e7a1fcc/xijamasivavofuveg.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609156ea19d47---91853926259.pdfIn PDF document text
    • http://954move.com/clients/4890/File/filavebalenuwukebebub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99af2ab0a---40447897231.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/49998332337.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/25235516082.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/dumunikurumafopuresulepa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8704c74cb0---82302718617.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f674be83d4---51442415413.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077083dc8c08---53278381464.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/zepuzigegiralerosufebew.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a868946df32a7535ad4077a75b9bcfb7/75338117704.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/ponegorawuwuxeni.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4fe8eea---kunasozarode.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/niu7fmcjkthf7j7509nl6f4f8d/rosarugawuvege.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/lasamisinis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=father%27s+will+bible+versePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C55E 16548 bytes
SHA-256: 95a2a289461248666cf6d6d18787e137cb33348b55089297f640146c5c630d6e
font_01_sfnt_off0002dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC9C 31852 bytes
SHA-256: fe5e36bf5e542f55826ee902fa9415a99c4d70e6c0bb906e87443c4b28811ce2
font_02_sfnt_off00031f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F6C 10284 bytes
SHA-256: 74d01381beff2ade07256e7ba0a192a6ca24ace61cc8b6ade0ab87bf04eba4a2
font_03_sfnt_off000336cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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