Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e8156ebce16322…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 13:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4f16f4037cac3f78b0e7c9f57e53977 SHA-1: 22a49d627d1e08bd731103a03edebc3b75515758 SHA-256: 80e8156ebce1632255daaa0c3ad58cb2425b8c53fe4ba8119a6cd436e5cdb866
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that the document is structured to manipulate search engine results and direct traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eh20frnuodrpqb14bfvk1snbc0/jisafif.pdf In PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bugukuderizizej.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/83212711143.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/79702484296.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57285329904.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15104679563.pdfIn PDF document text
    • http://punaide.com/userfiles/files/bajunazupixisuvujumew.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/40185420830.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec71354fbf---33022024949.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d472400dda49ee96ec3164146215276a/15870528654.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/70977232827.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4f2790499b210d67110e02429cadcf2b/diredizuboj.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/zekex.pdfIn PDF document text
    • http://synowka.pl/galeria/file/sezapejarade.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce33262f2---zavuzujodapigaronujovev.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xatevemosuduvudeterulezer.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/lufujoforalupujiwalulazab.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tavesan.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136abb96590f---lafis.pdfIn PDF document text
    • https://mklaassen.nl/images/file/zolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=angry+birds+2+hack+apk+downloadPDF 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 20492 bytes
SHA-256: 39fee89bcc48002785a8e8cd68667d0060322f6b5a21ed3e0541770d19f0e461
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 11096 bytes
SHA-256: 1e8de99a997008ff3a8cc47665d5bf86cd1b47a87c51e5b222667b52948b6d35

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