Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd210919ec6ca59e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 22:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b31a9d3b698efc9a7403d10ab4891517 SHA-1: 2585000112b883fdc88c69020d21e6ad48b34f86 SHA-256: fd210919ec6ca59ec78bd41d4811c6613f5221cfc4defac99f1af363424cbd3f
172 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to compromised websites suggests an attempt to exploit users, likely through a phishing or social engineering lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf, which can be used to generate PDFs from HTML, potentially for phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ppsspp+the+amazing+spider+man PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/434ba25bc2a7271a608ca1ac90cbcb4c/kizata.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/rufawafa.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/25950547137.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0209fdcf---kulajuxedefibirino.pdfIn PDF document text
    • http://rnralpha.cz/res/file/megupofenabe.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/44341942194.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/jozogelubonuneloloremu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/28026515627.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tajogobefepasulol.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/11822303731.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/68732843223.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/tizisopoluvoda.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/2814331499.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/t89imutor5tkro0m30nenmfd26/56646312248.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/36521695112.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910001500.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/12921312115.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/26459310134.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/fujati.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756874f908---78143015923.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/41141703304.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/korixufako.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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 17708 bytes
SHA-256: 4641adfc1ccaa0ef55b44a013289665bc582fd9635a55391081f229d42a8ac3d
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10736 bytes
SHA-256: 0eedf1445e1d350557caf52895602dbc43489cbafeedf37ccb317c06a90327a9

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