Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6aa9f38bf5db97…

MALICIOUS

PDF

130.5 KB Created: 2021-09-07 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 406bb2ecd03c3658e5f3960185526e9f SHA-1: 5cb3e8308b3c498b249e75c366ec64d268230ec9 SHA-256: bb6aa9f38bf5db978b56baa6175b39aa8398738c724f5ac08d1d21838e874599
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The numerous embedded URLs suggest a link farm designed to redirect users to potentially compromised sites or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://123natura.com/stockages/files/vopefujojufekorilexepoved.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e75af57caf4735aede1a70e734aba328/raripabapag.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/bugodap.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/43995136118.pdfIn PDF document text
    • http://iphysiology.ru/upload/genewazirepazegosu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/366b1412c201c5c8312e7d7a6808b511/54939743978.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/63567807217.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/lapivekugupabake.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/86722418679.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077701b58f2a---nolovelefubadila.pdfIn PDF document text
    • http://nscenter.cn/upload/files/95107972932.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/267a1f3e939e7fc2ba762dcacbe70736/gurimojizora.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc129790af---xebasapuw.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/56109539063.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d20f97fa3---pufarabajirenemofusedit.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/suxapa.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/jepuwatujovitibopofo.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ckm12ondmd4gt1fdf7st7j3fu0/13134734029.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/toxebosutapopijuroxa.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/22973051286.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/ripunoxesepos.pdfIn PDF document text
    • http://araonline.hu/uploads/file/dizubogej.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/90241377548.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zowibidirumomijagure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=batch+file+manual+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_off00019498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19498 10652 bytes
SHA-256: 1cedb410748b1cedd0c77548ed8a022d6a2793976b0fbb3eb4227c006943054e
font_01_sfnt_off0001acbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACBF 20740 bytes
SHA-256: 974f2a4723a3043a13cad1fd033f3392d78ee38ec990c641b7b492dbea5578ed
font_02_sfnt_off0001e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1