Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f62b672dfb9f4b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 66cba2ecc1bdfecb26bb66859c866868 SHA-1: e3c4f0c0f4ac92911dea48f588528be37a1891fa SHA-256: 87f62b672dfb9f4b88f86defcf39bd5ade2f11426fdb99aa1971d816a871e95f
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious code. The presence of numerous links to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71f8b9adf---19261815711.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e3a421d75374892928e5e9e017d6429a/zowapowulipolugeki.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/jokirodaxiburimowemeni.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rajerofa.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202192652512638.pdfIn PDF document text
    • http://irinabailey.com/upload/files/kexozokujuwomufalafopip.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/vokogak.pdfIn PDF document text
    • http://strahyi.ru/images/file/kajobozikotuxap.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1d832d967b21065df02c629678b300dc/fivabev.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mozibamemanusuxifimip.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/42338094598.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80493899374.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b6ed8ef0---84898678415.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/27834285320.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/kufodozaribupukofulogu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c3023560.pdfIn PDF document text
    • http://jar-ted.pl/file/pevaj.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6shcoos8fsn6sacbevj3dvnuo2/34978056238.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wiledutivusabuvadiralevir.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/43871538363.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136218363b5b---juxobiroloruboluxul.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/nisepunepovizepe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dujekaxibajosagafisoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+copy+and+paste+on+cell+phonePDF 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_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16312 bytes
SHA-256: 55f0ca9f98bd1390610fb9c20653d66efe90f42530bafad20a22ce377f7661a1
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 10612 bytes
SHA-256: 18f7df9df9e9d81a1e379b2c14dcd89ea5756b2e6b3167c9a6046ae74c8e5d03

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