Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3f5e99a6238854…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 06:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6636f06e550b48aa85d46648babd2995 SHA-1: 21ae316d4ff2b04ef031beca96af1571b292bfb4 SHA-256: 2a3f5e99a62388541cb1381efd662f991e56d2d9f8274328ba659841349f359d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and compromised hosting suggests an attempt to obscure the final malicious destination.

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://bbhshipyard.com/userfiles/file/pujasonaxolotituli.pdf In PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/10548638231.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/71909665550.pdfIn PDF document text
    • https://wrd13.com/force/file/31368693420.pdfIn PDF document text
    • https://solturism.ro/images/file/32049310565.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/db1cd3f985c476d6568bd76ef063ea51/92375562509.pdfIn PDF document text
    • http://3sdent.com/upload/files/72806280186.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/novukovesele.pdfIn PDF document text
    • https://educhina.mn/editor/files/30414301899.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/12358291039.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/ragisukebor.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/42620079071.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4f23ab89---9137558419.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/17405791416.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c31134e1---64609142347.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/nugexobatamedefoxufo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/57547885160.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/meliwasifoladarexedumeme.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/19621295080.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/56880409568.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/kuxifowedopopat.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/26215205883.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/vuxekakadon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+movie+editor+free+downloadPDF 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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 10660 bytes
SHA-256: 7b6c03c4be71e2ac542d54c4869e54de70dec8c924f09ff241e90c550b8ad164
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 16572 bytes
SHA-256: 9ddc13c041eaf0a49c1facb1cc213dc54fb486b54ed1aa78c9092adaee5d7564
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1