Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a5ae13fec8a12b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-26 23:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06dd4fdd1aa65d9cd9a7944af3cbaea0 SHA-1: 9bd1bd835ea93206bf2bac53727e2ff56e406354 SHA-256: 59a5ae13fec8a12becd93d4821a44133ffb7db6919b1c495932055aa2ebcdb77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing downloaded payloads. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://learningkey.org/userfiles/85535688355.pdf
    • https://majorsagilekvaros.hu/uploads/file/fuzemedanububuvubuxom.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf10496f144---95363679831.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7cfab467---76210231099.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a10fb75b41c---44528980424.pdf
    • http://humanitool.ru/userfiles/file/54652144264.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f59d42c66---80098484480.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/07c0ad54431558fdfc0f4e47764569c6/42759649242.pdf
    • http://usa-ex.com/89657861618.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/u54drrm94oo34kcujhu3j87eas/lekawo.pdf
    • http://bmcnx.com/userfiles/file/guvezusirobezisetolu.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977737b31ce---18254839066.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73b89eba7---34559339632.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/540eb18fe6d1ef1db96e683954214860/17624891741.pdf
    • http://camera68gialai.com/uplaod/quangtri/files/dubogetefo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8de6cf9---dozovadodobexemusofaxiz.pdf
    • https://armagedonspedycja.pl/files/file/fizexekakomibabipevofan.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8dae50d3---kitopivit.pdf
    • http://superplasticizer.cn/d/files/zadatevonewel.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c159854833f---25263717719.pdf
    • https://dehayemek.net/upload/ckfinder/files/sopigivotoj.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/84622924649.pdf
    • http://lab4050.com/upload/editor/file/20756162834.pdf
    • http://zuche0551.com/upload/file/vuvimawufizosopizitoveb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=merge+jpg+and+pdf+into+one+file
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
font_01_sfnt_off0000f8e6.bin
f322f2b992732878cb747a507efbe21d3122082cd4999639948fc6e4f03b1ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10628 bytes
font_02_sfnt_off00011107.bin
5a62094d91e3722d0e229b6704dbc39b2c8b8f5e5f1f0e8f996223cb5a179c24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16388 bytes