Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc3e0ad91daf35d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-12 13:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbe08ce1bdf7a9b58960f04b07e4375d SHA-1: 009f4af77db471ba11aa1c453332bc82a904ed08 SHA-256: 8dc3e0ad91daf35d12919107a8437a2b878c4d62dea877defe155d06cd7626b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crewmak.ru/uplcv?utm_term=are+bape+shoes+true+to+size PDF link annotation
    • http://stpatricksreunion.org/clients/84553/File/38166556724.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d191b80e722afcde57d3134aef86e86e/tidejam.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fuvozadaguvajudojun.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jigigale.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/mesirixolewikogalu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/13494672872.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9bdb84a406e97fd8a2bc685b4d5d110c/dugeridutuketuriwuvedup.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23230711917.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d1ef570dd1e00a9d10a5e0430bf75f61/24531607902.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zanosi.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/22595455264.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/34537775505.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091cb8ed8942---74641585621.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eaa3f1a8c---bofesoxozebokedowenoside.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wediwitalesupubibo.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/soxav.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b4342e7a6598615bde4770e28764692b/50884311427.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/37473902053.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611311c5e74d6---56345240710.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vasusidefizorebov.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a2bb6bb1---bolarosojatizow.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc5c1473df---10418968602.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210519/file/7656141193.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vpv3od7gbucd9irq4a8ojcv077/webimexajobego.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_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 17776 bytes
SHA-256: ee873dfc06c6ee8ba8232948a8ee1a9c54339c0392739ebb61f57806fa5b0107
font_02_sfnt_off00013a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 10480 bytes
SHA-256: c5d307d644f40f58fa0f2074a369b4886fe3f220ca9afa54d51d6ba57edaabf6