Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02aead49403cb40…

MALICIOUS

PDF

97.6 KB Created: 2021-07-20 15:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 745122676aee2ce579be8d7d7c056893 SHA-1: 2eaa1e8fc608e8d7304e0813852e07e889386c16 SHA-256: d02aead49403cb40fe283d53b3cc483d14f48c1d3b11a878efef50bbff8eaa30
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common technique of hosting malicious content on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://majorsagilekvaros.hu/uploads/file/80491980348.pdf
    • http://langeline.com/ckeditor/upload/files/88922203493.pdf
    • https://vigiweb.cl/dinamicos/files/file/96013502395.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9c5426c3068fc86cb9739d6c4bbf6ef1/gowasubijagotu.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860fb23d43f---40726834278.pdf
    • http://4reality.cz/userfiles/files/gobofelejer.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/bitafawu.pdf
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/zaredabobovusoxuwo.pdf
    • http://ddservice-bmw.pl/userfiles/file/setazox.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a34c55732---pavesaselomixoxerazatig.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210627_184344.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/lewiperuvef.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fade724390e892e1c0f933e158c1098e/fitazipebiparukukojorere.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ad1be107---32296298338.pdf
    • http://chalappuram.com/userfiles/file/risaxitop.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba723011f5e---lototu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2e925b63---31126180557.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ee2141231009df03695551130cb7eaff/ralufezusine.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b648202085b---dekamafuwosewuporajovufa.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3034436f3782a23b8c3266b9557cd9a3/viwukofuturufik.pdf
    • http://area100impianti.it/userfiles/files/mojan.pdf
    • https://jotelek.hu/files/file/12236585923.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22474009f---rijijem.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/citk8hlo1emdf5sjo50jhghb30/88847573826.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=software+disclaimer+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011913.bin
1f723f90fad528e7d71002c9be17066466244de85e19fd875954f3ef945408aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10940 bytes
font_01_sfnt_off00013282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16792 bytes
font_02_sfnt_off00014a94.bin
4ce82ee018aa648711ade8b1d8487799b8957522d95b7f5bed0285beaeabe343
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 17728 bytes