Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bd3b42410c92d7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 01:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4b1ab1503a458bcc85feeeda7161868 SHA-1: 83df20679ad1ae2ad5d57594af1f73e981f2e65c SHA-256: d1bd3b42410c92d77067ed3d7c50b9212f071727108117110a2becd111e06369
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many hosted on compromised or disposable domains, suggesting it's part of a phishing or malware distribution scheme. The presence of JavaScript points to potential exploitation or redirection capabilities within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flooroverstock.com/admin/userfiles/file/89077935439.pdf In PDF document text
    • https://maydangson.com/vietkiendo/upload/file/83255058792.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/66713648466.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/70629423587.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozoti.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/nalupom.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31236812212.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/89268837295.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/binajotizegekedod.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c9b94abd6ecd3731118a0b1c39f90fbd/kifovazumenulogusomubibim.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_AD87785F60C7C5B6.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/nukomudikinepu.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zotasojewa.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tiviziwuzilegutog.pdfIn PDF document text
    • https://invision.buzyhub.com/files/vopuwepejuxuziwuru.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e3bbdfc0---62957200327.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4ghdq2ad8pqfq411q6aub4h742/mefenuwasediveduxix.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/21640918276.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nakasenilifukesumelaf.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/77480816905.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/57347997986.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/xuxawegala.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/lutegegaxujejadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+default+payment+appPDF 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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 16824 bytes
SHA-256: 072936c2d263501389542c66eed08ecc59d3493b21b23bcae3c05f485e9d0352
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 10684 bytes
SHA-256: 9c2725d60121fe3b594272422bef63c76a22996a151cd3017ca2a770ac212840
font_02_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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