Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a28fe78399d26e6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 05:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db4225c9dfb17e871de8ef5867170a19 SHA-1: 62420ecefb833c099e3c6addf78db62ff35e7d9c SHA-256: 8a28fe78399d26e62445303cd985d20aa57d70b7be7f4b4f7f19e0de9f1b17f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to external, potentially malicious, sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=shutter+island+tamilyogi PDF link annotation
    • http://gurolmumcu.com/userfiles/file/wopodudaduzef.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4cf225eed4408d5bede8b02270ec727b/39689959694.pdfIn PDF document text
    • http://innersolutions-uk.com/file/zufozo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/tufefafegidevibozofikiruj.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/wesinabinibabetabesudaba.pdfIn PDF document text
    • http://agilesolutions.in/uploads/44201629644.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/pulotuguf.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tozopisireberikije.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/98518263573.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zavusidofadi.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/bilivofejanoni.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/45140796002.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/gobaramimagikonazen.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/12315447994.pdfIn PDF document text
    • http://hkwwta.org/userfiles/32858235827.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/18694576081.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/69959380461.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/447145c044ba85a7208ca35df0fe844d/91109018116.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/27361947618.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210918173755.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/80450716996.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/somupugojogizefovasakizaz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f3a6620c7d5d53777568c50d08ebae70/sukisatobefida.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zekaziwaxivojipudanonux.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161392b65f0264---jezok.pdfIn PDF document text
    • 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 14852 bytes
SHA-256: dfac410d5ba2b00e683df4e208280f60bcd8d9f03991e47afcd716cfcf73aa1c
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10984 bytes
SHA-256: 2090a2678d1f182b8b4715974a42e587dc77e8aa040a931696b14351d9930681

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