Malicious PDF — malware analysis report

Static analysis result for SHA-256 66acdcb36b38e548…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 139b37617bd44dcbb8561fc07ffb26d2 SHA-1: 3d0e86589205ab12705b5a47d4d5d8a6934ba355 SHA-256: 66acdcb36b38e54808830a38dedfc49680048eddd3e7bac684bf92b006c15a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, potentially to a phishing or malware distribution site. No scripts were extracted, but the structure suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adhdesign.de/userContent/files/20210828150751-38415220709.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ab0d42b28bea81c0a06bb26a1a887fcf/bivizezodedomowe.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/5853385201.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d5nkhjjblbqm5gtt921lo8hcek/28837983262.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976961d8920---giginugizategazagu.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/21487859200.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/47319618578.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48931b884b---90300860974.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/temogozetenulaboj.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/rufor.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/tapib.pdfIn PDF document text
    • https://premium-house.uz/images/file/rakodanagexeku.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/tetemad.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dunonut.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f758c0bd1---gesosajofosas.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/22791801817.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54815925590.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc00947e0---genadabumeluvan.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210806094758018.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/98666983764.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1fdc9f202cbb63505c1c5dd1c2fae9e5/42560280344.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/34989819524.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wubatalezonasolodorazite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=site+reliability+engineering+pdf+bookPDF 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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10928 bytes
SHA-256: 38e13016071b4572c66a8f0faa9879268e15c64dbe4ac8709648ebad683aead8
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 17716 bytes
SHA-256: a1cb93797bcbad67e476e6aa3b24f4b88b3c9fe66f502479ec315bd0da4bdf95

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