Malicious PDF — malware analysis report

Static analysis result for SHA-256 708dbf948e16a196…

MALICIOUS

PDF

95.6 KB Created: 2021-09-03 16:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 762bc6b4c78b9ba06e98173b25ad2a58 SHA-1: 67444f74bbf352e80ee002ef804dbe4ddc8f8b14 SHA-256: 708dbf948e16a1968995bb52c68eae0ef4623b8c1350a4cf8a023f0f2fcbd8f2
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a lure to execute commands via the clipboard, suggesting an attempt to download and execute a secondary payload. The document also hosts a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kutscher-customs.de/gfx/userfiles/files/kevirivowiso.pdf In PDF document text
    • http://gibisch.com/files/files/rowuxeroronomofuleje.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bo64d7mkaqthbcs5lhji6s8fk0/51862105304.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff199615b24e286fadee4079795fd254/wiludujaz.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/fexasasupapigilekono.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8798badac2---supeleraza.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8808aaa702---89495991764.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/18536087520.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/beratawafusa.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/29008173355.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705e4faefb9---75065883231.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/fatovulimojigekobejer.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/96570170880.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/61036566502.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/25859828462.pdfIn PDF document text
    • https://digireg.nz/upload/46957324151.pdfIn PDF document text
    • https://majubesar.com/contents//files/71846697458.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/sugufevilipar.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/topotozoduxunajurejuvajo.pdfIn PDF document text
    • https://iword.de/userfiles/file/34716461920.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/37440182636.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zupeputan.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/noforenopal.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/32581787559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mettler+toledo+checkweigher+service+manualPDF 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_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 11152 bytes
SHA-256: e70dbf5af891cf4369d7bdd8510676828ea484d281c46078bbfc5de8eac886cc
font_01_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 18896 bytes
SHA-256: 57691354aaaa2514f2617c2a316ce8cfc6e23cd89989c38e065279799e0fd28d