Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440c6d985a375b7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 19:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 503c11b98dd1c385e80e31935bcb8165 SHA-1: 7f9a7366e5666f21832b1c12320b4cd118273c81 SHA-256: d440c6d985a375b76ad7c448174a8ec24460d5542d05346ff024b8ec46090353
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of these links and the overall structure indicate a likely attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=what+is+media+server+on+my+android+phone PDF link annotation
    • http://karate-talence.com/newsite/userfiles/files/bijoz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/70e0720faeeef7fb4aa02f19583947ec/vulonozawijiju.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ad81310a2d.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/ginivepazamulifajigemo.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/dawebidizexomokoxafabom.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2a939d93---nikenosinerudiwakerinega.pdfIn PDF document text
    • http://ropesadventure.com/d/files/19271160037.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7cbc96c599a57d068dd4264076b375c/39991834680.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/072e10c1508e7e01492b97a13f298780/lokomuduf.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944e1755d4---14644084123.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/95437382457.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/xikiped.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/74942542481.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/netigekox.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/pibakuremakigug.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/62181144451.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/pusetaj.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/sixipozuwo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb37884ed---binarabivelonipebir.pdfIn PDF document text
    • http://espokebar.com/uploads/files/78870489927.pdfIn PDF document text
    • https://latework.cz/soubory/99285088910.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/powisinivuvozavafimitu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7884f4a85468cd326a98819a7800d703/81372862566.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/puxamut.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/62045367802.pdfIn PDF document text
    • 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 10784 bytes
SHA-256: 76b2b09a3f59daa95c5f6f9eb88cdfd753e4c5563706c3b961d76b080b504ec7
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 17620 bytes
SHA-256: 1337c7e78be950ffcb3e9a6644f68e20d242b35a5b389bc0aad4cdc0ee8b474e
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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