Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b36663d2b53715f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 14:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e7f5d6dc19eea4ecba015c91a1edb96 SHA-1: eaa71361f128689c494cd61b65eb3e06ca1dddce SHA-256: 0b36663d2b53715fb6df8540a60c04578f1a9a0610a8d7a645f579a822d4229f
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste content into a shell. Several embedded URLs point to potentially compromised or disposable hosting, indicating a likely phishing or malware distribution attempt. The document's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adikkeempat.com/contents/files/pufajisikinajus.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7eeb179a---diretomajonugopase.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de13c3636f---37089034235.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/94935292570.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/lusizukisekalefezobu.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/guxirisutisiwowufomasa.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xazoxukinisosofunudibate.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/18640956310.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/9521613197.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa39a45c---rilozejasebitemasagiliju.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/55432246491.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/37487443077.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/97623473100.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/parul.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/41617598928.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/gomirijaxexoxo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9090a6d7c3e0f0ef789a3ce8f9165cad/30486503789.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0928888001631769424.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kogemuwuzirumejavonem.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdfIn PDF document text
    • http://vanhacollection.com/images/files/rupipebalove.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/buruv.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56368155098.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=es+file+explorer+pro+mod+apk+downloadPDF 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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10824 bytes
SHA-256: c482e3d658bf77235117943078609952c4def635d7382718cbdda69cf47ce2ef
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 18972 bytes
SHA-256: 1f37e92358ab2e9dab39a3027fb3713a1fa6fcfbf46bef86d5f1c72f3161012f

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