Malicious PDF — malware analysis report

Static analysis result for SHA-256 484cd8ab9663ba69…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 13:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37043961a6578b6a0a0009b8ad95a11d SHA-1: 9737f867af135f797aeee1cfd44435fc76997974 SHA-256: 484cd8ab9663ba69221a5a6e16997fc58a00f49bf3d552d1db5f99f34015d32f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://chukguwang.com/files/fckeditor/file/40436570206.pdf In PDF document text
    • http://5thaveseniors.org/userfiles/file/wekozewezazunigaz.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/silipaxopunazadiwi.pdfIn PDF document text
    • http://e-district.org/userfiles/file/78962682296.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/ledigixiv.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/53238335262.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c946b323---3756921363.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/mixekagawoze.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sasiwemetemufawemogujox.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/8474077867.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/luregixomexiralaza.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/64402678086.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/wigopukirero.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132381a4b8f8---44906225001.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/velebipuzajevub.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/30435154892.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sewodenunewesede.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/lesag.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/52745838683.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bb62ef35019099793b72058df62ed457/tefexesokakonipimatoxog.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/83296883151.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/xoxos.pdfIn PDF document text
    • https://hoalavender.net/upload/files/54519407913.pdfIn PDF document text
    • http://valeneighbors.com/userimages/purigasi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/tozosabijetafixali.pdfIn PDF document text
    • https://slotpt2.com/contents/files/juvobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=personal+finance+for+dummies+canada+pdfPDF 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_off0000b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 10784 bytes
SHA-256: c1be5144aad43ce01f26114a98d3a1b0a7b437a4aee18c56337c70989cb16b45
font_01_sfnt_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 16176 bytes
SHA-256: b0877cb5f52b9328bacb24606a5117019e9776f0a3afa59a6b78755d11661879