Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec95c668d6a3bf7d…

MALICIOUS

PDF

77.3 KB Created: 2021-08-08 00:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d3aa1a7033127b9c68cd1e11022fa61e SHA-1: 4c786a8326cde40401572423a45ae2cd08766727 SHA-256: ec95c668d6a3bf7dbf8ae4a59e70c7e37552444bc7ac3ab1fa22191ac13d0e9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=mazda+mx+5+nc+workshop+manual+pdf PDF link annotation
    • http://barudan.hk/UploadFile/file/20210629163227115.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051009112496.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c5e149dc---faruvujapevak.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16087e11991c52---75973979482.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/72148730642.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ced26809e---66463843319.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1240b08cd7---67772097087.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/89923393796.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a30d4d19---texep.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/27370707117.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kezezazapazeluna.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0915dea6145eaa5a9bee9e4df79e9228/kusimopikef.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5482ff5b0ef88f4a2b5832208aede064/91874666071.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/13254663665.pdfIn PDF document text
    • https://anaksemut.com/contents//files/zemotu.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/88606990142.pdfIn PDF document text
    • http://vodnik48.ru/content/file/91470707482.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/45158587632.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/eb179486f098dd28709c68c26e9365ec/81135847606.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210708101331.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/mefikajosigulukipine.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b342747d---jovosiwajupabogukebomu.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_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 11128 bytes
SHA-256: c8db4d6f72970f5f64197d05a2c98a07c7f21ac5f25c6409febc9046b8c2ff74
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 17900 bytes
SHA-256: 854c079f9bbb14343da9ac68638a69d076e30b7e59b17f4048bde7faf649f040

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