Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede68a93aeb3cc99…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 08:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 29c8787cba07dc29e2255c54743680d6 SHA-1: 2e7094cf9d1971b00e427d76ea67aea0fdb0a9d0 SHA-256: ede68a93aeb3cc99cd1e4ab77662713de45093d920895ed3460bfa832782db85
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a pattern of using search engine optimization techniques to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=strong+granny+mod+apk PDF link annotation
    • http://wccflooring.com/userfiles/files/95866904701.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/99649704811.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210911201956.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • https://festacontinua.it/public/file/13002493660.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/dagezazabotenejevamutixa.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/56100746634.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/97225542906.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/u5iq1vup7jo6eibh9nt44igmd2/zenomizuxejuxivuxekogate.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/8220388204.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///34367089808.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/29f84a6e547c7d9108d8da3860ed11c4/vamifeb.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57728626592.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210916212408.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/muvokanoxup.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/wizinewinomuw.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/lilukefojazonowazibifex.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/62631356165.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/diwetixobazopame.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/tadeforitibefid.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139b51951fd8---sotuluboxamawariku.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/45389751647.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/najuzejolotiga.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/15800920137.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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 10580 bytes
SHA-256: b015aa0f84d711d80800e8f73ca1410f93f2faece9cee0e9c92d1eaff173e31e
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 15744 bytes
SHA-256: 5aa28b3719d427ff58f2a65c0a06bc38b8bdf49fb33c4dc3d7c7c73a64509022
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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