Malicious PDF — malware analysis report

Static analysis result for SHA-256 617c5ffc4e797190…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 15:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 446ea8fa68c8cc08b24712ba4a0c4a10 SHA-1: 17c00450773860d17892d686a55594c75faaadfa SHA-256: 617c5ffc4e797190a28d01093f09f74b59ceb78b4ce912742eb89ea6c016c712
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document likely instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The presence of multiple URLs pointing to compromised CMS uploads and link farms suggests an attempt to distribute malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1d380cca---pamerakumujexijasu.pdf
    • http://ok-poland.com/userfiles/file/gopuzovepipeliw.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c351004855---gupajokizufajisol.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfe55414a---fafuwowunigaxudukibax.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607642d9a7f34---80152186281.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mr38ks8pdehpreupjovtg002sp/72657270238.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81ba2e733---92426995546.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3a7cdc42270218a96fe9bcf70af3cc56/zixujukowefedewuz.pdf
    • http://akicgiyim.com/userfiles/file/25835224167.pdf
    • http://chinoboxingclub.com/clients/36032/File/rugamorojoj.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/70c31345cbce21ef2b9c736c65442f3c/29530174535.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kl0shs0m6c4us19g9vk4jpa2tf/55706696693.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/db8a1d6b0b4ffac1b82fb455c2b407e1/nowiwidesasuwoguluridad.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609af517c4f1e---62455248477.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be74f3e05---sajekuputuve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+activator+text+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de93.bin
126d199b9ea8ffefaed387e3cc6ffecbe91de580446f0ac10a8621ee56bec325
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 18060 bytes
font_01_sfnt_off00010e79.bin
1dd7dba4aadf1b6c96b15dd395134ed51c2138b0f68477fc084cb97adefcfec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 16972 bytes
font_02_sfnt_off00012577.bin
e5b81735b636bb9e168e71ffc36927f16bbfab9285a8c2e053bcaec4bc492915
pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 10892 bytes
font_03_sfnt_off00013eec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 16792 bytes