Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbc50339a3f39da…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 10:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44b72471b3693871dd9cde0d59574b22 SHA-1: 70e1162c2b3b2213730a103e22a48cc3e575045a SHA-256: ebbc50339a3f39da3f60a361e262fa501d2e04090908b5eb255bff7f34a4e24c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable infrastructure. The embedded URLs suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mtecommerce.it/public/news/file/64458439839.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab805c38069---ganinatobuvufer.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48bd73ac19---10079521045.pdfIn PDF document text
    • https://mytopics.it/uploads/file/nakutuzatodigisun.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/vodejinenazekosivetu.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/bigaluzujekij.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c46e79a8f1---wesevofesamonupi.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/bunolamobadosuwojazaka.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/23618793886.pdfIn PDF document text
    • http://ropesadventure.com/d/files/93533762043.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ad9cd6v2pg35o3aalrt3k6ak44/67953493870.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/57603830015.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a34099e82---xuvew.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/kepizusel.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/54517818994.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0ktupn1efolijkfcg27kg7klbf/nikobakox.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/64100199726.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/rapuzugowuxobigekegogegal.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/50359894887.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0jpjgsb49m95s5mtt948m6qn8t/23176165003.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jajaderozetezomokis.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/lavivujodogarapiwevag.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210626_82E4A78FB8D8A71D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cleric+dnd+beyondPDF 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_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 18420 bytes
SHA-256: 7c5668521dd9a0da8bccd9f0b9c0d92f345e0bcacc915587fee438442f8686b4
font_02_sfnt_off00016346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16346 10220 bytes
SHA-256: 8ef83e2bde6554f35e4cb388c0956f13ec7307ef7adf46efc7916c796861a358

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