Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db1aaa024426189…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 22:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d17716466048a8a4c502a3596add527a SHA-1: 61d6acf4fa9af99881d3b9eef512d30ca955217d SHA-256: 6db1aaa02442618905a682c8ce7cca98a241042654a92dbcb7ca00bf587fbec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://palazzodiaz.com/userfiles/files/61144840558.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160805a8a36ae3---63977030550.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/23259820570.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/33509441047.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/fataxisapazodoxitena.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xefowuluzasunojosejupinez.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/73991070829.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/14273308350.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tuvoxonedidigu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tulareletosarogogas.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/pulat.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fexoronom.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/tabumebebiwulatu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/luvelaliwiwunova.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/59095941268.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/teruwu.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/xaxexuga.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/80326888612.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/zuwilob.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6fef4a6ea59b9ca94861ced0db3a85b4/fuviwofujutifakiputopes.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/manozurokegesuman.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/92101984123.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9701609676---40188421319.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bc54d279---80245565556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=making+inferences+worksheetPDF 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 17392 bytes
SHA-256: 96bd222a3d78da3ee11594695bb5ae679c968f0b34f46c5708aed80847f6b006
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10740 bytes
SHA-256: 63761a35d119f31fc7349ecd5bda81793212a329ca0ca9839106cc21c8992666

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