Malicious PDF — malware analysis report

Static analysis result for SHA-256 5143aabf97bb40ba…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 12:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76bf449a8bc51686fc9185201871716f SHA-1: faf534b69070f09b78705d9f227b185da979e697 SHA-256: 5143aabf97bb40badc99279c62cb58fbcd332d72186f5f44a2f4ecfc24fcbc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://pixomot.ru/uplcv?utm_term=cracking+the+sat+2016+pdf PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499b079ae4---tewokex.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/87893095451.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/26195137973.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a718094761d---39891969302.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/60790120270.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff24995a8be---kuruberemirerigulimu.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/jorenozokale.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/zivenebikisig.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/74393545506.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/14573979415.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/xitajowerazabav.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/94a62a4a8d55ee7c0f06aeb6f8cf0b16/negajudonede.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rvmcq4h6c66574heq2h4nedq7j/xedepez.pdfIn PDF document text
    • http://abwessex.com/uploads/files/lorujuwafapotodu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23070a6bc---9178635716.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8371188c---zizulobe.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607267ac7e93f---mabiporogoruz.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wipufuwonuseromujojefuza.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/34750809293.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/15458416254.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_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 17972 bytes
SHA-256: f38a6e3854c04d0e34be03f30a584f1603eeb68ff2af006e85327584ef112adf
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 11316 bytes
SHA-256: 2212456e4a4e14fc23bc88211c93f7a2eab47854616b29d3d7c519d4b7dc786a