Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdcca0bcc48efa6…

MALICIOUS

PDF

91.8 KB Created: 2021-08-31 10:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 67278c2d6624c69074e05341e233ed2b SHA-1: 88bb31570fccf3ad935edf41e6aa91d4c0740c45 SHA-256: cfdcca0bcc48efa6aa876964570958f94d2f54df76f4c338f98806892db3ebd6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy content to the clipboard and paste it into a shell, a common technique for executing malicious commands. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a potential distribution vector for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://ashokarefrigeration.com/userfiles/file/tezapujovu.pdf In PDF document text
    • http://fitviewer.de/files/file/81567597662.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/73545032399.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611469845a2f4---kuwekinufupet.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7b8c341046b42d3f121f0bf5e5446d7e/zanufifidagisigexi.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/16478055224.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210707050055_ec02c.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/91564379943.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160894f3256d10---nabedebewupivevelol.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xavosegivebigagusalurajat.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/tikuwugukikituga.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mazikixanup.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e4a50afc2fda13820c93a3df293e0ee7/rabofemu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/257btffkamiuefnr2rpjvuq3t8/gabeludevobonidatojomog.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/no30l20bg8md65kvkgkh351v4p/11952955760.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/55982628799.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/sorazukus.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051706243573499.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/banitojipanefanesedi.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/45191249993.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/80881339332.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/bivajoxeg.pdfIn PDF document text
    • https://turbooto.vn/upload/files/jepopowawa.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/22475829160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+open+a+pdf+file+in+java+web+applicationPDF 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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 20008 bytes
SHA-256: 09033fe679bb6df5287b16f1b37661a833ab0fa22446dc51569471da622e29e4
font_01_sfnt_off0001300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 10760 bytes
SHA-256: 30ad02d3850aa06e5f7ba8a835ea87908689f91547da036bedd18573c0c19f1b
font_02_sfnt_off000148a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1