Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9977f053020c2b9…

MALICIOUS

PDF

157.1 KB Created: 2021-07-25 02:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec3754259821f1224b9bb5894daa2a13 SHA-1: 9c27eca080fee8a16fce93cc9ced8a0ad0c1ff57 SHA-256: e9977f053020c2b9d08294e0603346a1856dc1298f0ae790bf6b347824d6e2d2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF functions as a link farm, containing numerous external URIs and pointing to compromised CMS upload storage. This suggests the document is designed to lure users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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://wittlich-luexem.de/userfiles/file/66847261842.pdf In PDF document text
    • http://geoplan.su/userfiles/file/benoniz.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zijikiv.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/mifivibejuwenu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/380b97b4cb3a73319efb508f48eb0172/94896872801.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zepibamutif.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210716230259115.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123c1ba92e---16719544095.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e2ab4b95b---tudovuzez.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/gowuxogotasume.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/54062590396.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/86202593554.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1115b0c89---diwabimav.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a290e0ab524---98181614212.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6e1870sguu71b68rkec1fj2jod/mavijojiz.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/59895217017.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ecfd6ffff---84110198485.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160722d9337b80---93635770661.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/iptur9530pg1e3ego6449rfl53/mitutekabo.pdfIn PDF document text
    • https://stopserv.ru/files/file/43466209004.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/visezi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/morovitigewor.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/mafasebonilibikesum.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a676add232b---wetawugerajaganadez.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wejarilefek.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b12d51da---pesokipot.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/309d2b60a43e971900fd41eaed10bc1c/rofumoses.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=role+of+fate+in+oedipus+rex+sparknotesPDF 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_off000206e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EFA 17496 bytes
SHA-256: 41503d1935573a2ad9e0b79f84bae72e0564cfde573be321da705bfee8148266
font_02_sfnt_off00024c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C67 10832 bytes
SHA-256: b6254f3f5069d0f4c7de9df4c79cbb32a812076a072f85c37bd8a2bae6fdb526

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