Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db754f082e634d1…

MALICIOUS

PDF

74.4 KB Created: 2021-06-22 21:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 75e7b471a2b8f726cdb40cb76d9a3f3d SHA-1: c56984a4fc01d7079bf4a0efb3a56d820afbb80e SHA-256: 1db754f082e634d1cac9285f5492e321f9699ca28cae244d450721825d70749c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to create a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bi4fua5v074e0f7ukeqihnibd5/nalazifuveruwajozopa.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629c57a00a---xonilodewixatiduduzojevo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d979cd6b24be1feb14ac175f26d9a13/kobusupofibol.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/43b1b26430d0d827c553e90539dea305/30726504098.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b312ed50fbc---kerabigegojaxira.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94443134531.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd214a264---10359492287.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/tinebogagazuxijuvifalej.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/5d2rf152nteatsprtegm8gumvi/vixuzolirid.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rafunimak.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91a08d092---lunebezebosapawa.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/kapamiduritat.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d67e27c2---loriwipedokulodemenuwevu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5efd94a525d22a36b0ab4bbc11990a4a/50409318748.pdfIn PDF document text
    • https://parfumzone.ro/files/file/xemuxolifijifodasul.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc4aaa2ef---loxedoluvadukibilaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=complete+repertory+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 4808 bytes
SHA-256: f9f8ea960f564d90ba37e689bebe19f67a4cc69998f3319ca05b87ea75c89307
font_01_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 11828 bytes
SHA-256: 67aec54a2dd19622ddeed8ea3fc34b7858cc70326610d269bcb4920c24149ad6