Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f94035892af6c3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be3d74d4dde1da57b5ce3f7bd779a668 SHA-1: 873d1384fccd1338e4e4952aee7124a40a7de4ee SHA-256: a3f94035892af6c31d0a223b6ba706f030460af580c5ee466771231d393415a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads, suggesting an attempt to host or distribute further malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://toyotarent.tw/FileData/ckfinder/files/20210902_4299083DAD484297.pdf In PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/potolipojerazixejuna.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/rinonugavizofipod.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/24678877443.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugogamaniduwuvaweku.pdfIn PDF document text
    • https://music-group-store.com/upload/files/19854623245.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613910ef32841---nipaxeg.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/sasiloveleza.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/87ff4799c0c5cd53cd482127725d6466.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/72077446696.pdfIn PDF document text
    • http://sns.hu/_user/file/93596374053.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3d7daf7dea3fc39abddff0b0cf5995ca/48140694164.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/11532924327.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/50724928978.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/36279583867.pdfIn PDF document text
    • http://topp.pl/_topp/file/goxuzarawagoxat.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/7756995839.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1706879ccb55bb8802cbd9c993bc2cd7/22277028949.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/63035101370.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/sebaxosizepawuwasow.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48413931277.pdfIn PDF document text
    • http://goldmustang.com/files/files/66913596189.pdfIn PDF document text
    • http://www.pvvc.cz/files/40735700453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=structure+of+dicot+rootPDF 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_off0000b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 15824 bytes
SHA-256: 3ca4f8e7db94845b4873addc6d479c16d8d8a9924ad5dadb560dfc9272002d2e
font_01_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 10164 bytes
SHA-256: 918d17f8d6db7fb0729984545ba02e2b0eb422d1b622c3ae97fedc61a16d743c
font_02_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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