Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cb1e70a2f70dd8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 17:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ccb0714848ea888d04b73ab5708d218 SHA-1: d7551e65bc65b573711cb75ee30b1ad347225767 SHA-256: b2cb1e70a2f70dd82ec40782bcaea889e53d7e7506a4f52e8733f7a813da4057
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URI heuristics indicate it's intended to lead users to malicious sites rather than present legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7da68e38---43572665096.pdf In PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/xovuw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/49475154248.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/58378316869.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/ruvudifitumovawatab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089199fa4bea---newaze.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/bozupujiwoba.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/46fbafdbb32dd2adcba56e160a57e915/81708281997.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/91d9611a6a72f26499b89878bd4b3d0a/labuwujudibukip.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec13ef24a4---45462805541.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/36722602218.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210805_E469CEC2510E47A2.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/30119131294.pdfIn PDF document text
    • https://avenue102.com/uploads/file/27033510796.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210617235647953499wbwxo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cqhldnnfbksr7d6t944i8cqe4o/73707330033.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c0dbd7b49---tizadifubuta.pdfIn PDF document text
    • http://tencanpowder.com/d/files/kevawuxaruz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pvqke4csigljsbff0or9g50966/xenofapunisoroxixef.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d0b675e4---tobegaxadejisagada.pdfIn PDF document text
    • http://honghuibio.com/d/files/97445412606.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/tosiranoradasipugokexev.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jexikikigused.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=english+speaking+book+pdfPDF 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_off0000b6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E6 10792 bytes
SHA-256: 2a7ea6cbe6d974db19ed366b206415f9433835487db6e8de0bf8b7f4468a47f4
font_01_sfnt_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 15568 bytes
SHA-256: baad37b8a1a6726ff4e21df27ac0a5bb4e81a33a7a65e87286950b499123c4de
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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