Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9a1bb2b368c9ae…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 13:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 379458f26f2c85b18eda99f0e8b72b9a SHA-1: 58142c5ef7908e3547ed3daf1a66249f60d873b4 SHA-256: 6a9a1bb2b368c9aecc3b889d520dedc3ad92cc027cade80c661bb7b4ebb6e3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rzfmuhasebe.com/userfiles/file/70869076078.pdf In PDF document text
    • https://hr-serdahel.hu/images/file/59232717375.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161316374d4b5d---90658997178.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/moxulubevadokodede.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/bibos.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/wenelik.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/tapiwanifa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430a1232c91---gimusoja.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/94687044545.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae4cf1d8e3997d2e2c9505194a3c0d82/89830506850.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/aabae35b187c278b0b9487955c79f5d0/99519753855.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kisopoparigapuluxurasu.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/87937022040.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/97356253766.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/judisibamumaguwebitim.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/174b14acfb8b868d19591e82f82e477f/figiwibinokalukuzokisow.pdfIn PDF document text
    • http://webbuilders.com/files/file/lojipobozuzumuwiwujifuj.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pavopojidubixazabetizu.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904215048.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/88652978257.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4da7baa30a17d8785b6dd26ad43eb366/57304683380.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9a867a5a---wudokalolegu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/3573716175.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/divef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+shades+of+purplePDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 10836 bytes
SHA-256: 65022c4d927ea15af8a6fda33a049155c8ff9985ad82931633b1f1d279d22de3
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 17624 bytes
SHA-256: 3dfa6060ea51869dc8ff6f58506c1561b7b0f00285aa0d14f5f939e1572ecb6d
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1