Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35c5a57b66dd0a…

MALICIOUS

PDF

92.3 KB Created: 2021-08-16 02:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55f7b36f6557c365aa515b84f6cf7850 SHA-1: 85350d144ad6093572e246bee5cc69860839b363 SHA-256: 5d35c5a57b66dd0aaca2a60f2300930b629cf01b51f17fa71dbcff050db514c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains, likely to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/69326522111.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jtssrg5upq6fnvlvckvopo10pd/91900499294.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/noketuji.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/91805897410.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0aa89fe24002afdb87eb7c88463fbb5c/75025524229.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/92467973422.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb143ab004---7207745028.pdfIn PDF document text
    • http://df-foundry.net/d/files/wobakefa.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fcac416a53e849485d3764f03c91c507/83301522092.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/wagevodigapezetezo.pdfIn PDF document text
    • https://petikdaun.com/contents//files/56634616469.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jufomazaj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c710c4e7cba---73503631297.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/furibewupipidunuxaro.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/61ab396b466fe6e85f7d32eb379ea87c/89523918440.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/61820732640.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ce7612c7---63519405356.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094440847657---rigina.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/teguk.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/kadidawepulef.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab851c2b44e---dikimar.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/favegadokusujeges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=los+numeros+0-100+worksheet+answersPDF 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_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 18416 bytes
SHA-256: e051bdff68eec9b58c35ca3bb877a189136d99e706f931d6a017f0a86ede4941
font_01_sfnt_off00013202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A19 10680 bytes
SHA-256: f2f00fc3d31ba344e06dc4296ab6df13fc81c60f87054003211dc497e9384952

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