Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d91a2ef74c16ef…

MALICIOUS

PDF

95.7 KB Created: 2021-09-15 12:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee5706074577698adb3f4b22b28910a1 SHA-1: 2ef69a10d2be1533bb78b5ee8a2203b2e964b220 SHA-256: 39d91a2ef74c16ef0c65cf325acaf38245aafbd9a5104e0aef6f8f9731575c8b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy and paste content into a command-line context, suggesting an attempt to trick the user into executing a malicious command or script. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://maychieuvinh.vn/upload/files/5975556994.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f2518fa6f5543d61a0792be375729fec/kevegimowabopezak.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/xowaxafomipagukid.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/80083722084.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/digamuzegodipafagomamib.pdfIn PDF document text
    • http://guowangcable.com/d/files/3522950271.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/43815934149.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/43233682001.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/97390184777.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_40E174DA6724761C.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/12315210592.pdfIn PDF document text
    • http://dzbnf.com/upload/file///22141087840.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/sobek.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8dd86efe---2904371166.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/16568207416.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/19148784799.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196183251269.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/49767358711.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/xifunapixobasodexek.pdfIn PDF document text
    • http://ktcz.eu/files/files/xogitiki.pdfIn PDF document text
    • http://cl-pub.com/files/files/rumiduvake.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/46952080869.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vv9nt44mqi8tvsghuv2lftmu68/tasegoxabafegugegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=osu+download+macPDF 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_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 18800 bytes
SHA-256: 00acdc8b97a90a24e65f5f19b52e946b5e1bdd11d8bd0214d7bbac572fd78c8e
font_01_sfnt_off000141f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0F 10320 bytes
SHA-256: 620694be0c65a947abb24c3d3b345dbf030ea4b6dacb3fcb02ab71b1328ff681

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