Malicious PDF — malware analysis report

Static analysis result for SHA-256 964a5f45df3c34da…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 11:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e86fb7653029cb0fa9e92b43f7e5e82a SHA-1: a44034833dfe3812f8c320119927b9110b7287f1 SHA-256: 964a5f45df3c34da9a66f9b7087750f3ae84af74481e26357f3402ed12d9cba3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a lure that instructs the user to copy and paste content into a command-line execution context, indicating an attempt to trick the user into running malicious commands. Several URLs point to compromised WordPress sites hosting PDF files, suggesting a link farm distribution method. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uniquehotelsolutions.com/files/others/11752609624.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2beb45bd7---42853059776.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/ropogubisuzibozij.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a5a7c6b675ea62da4b34d32ac81832dd/depomuvaposenatodi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5b789d1f---zujukilon.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dae880f2780686b48adce7f783d53264/raxopavewanujuwozuwitam.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d1303e705781792b76f94ed44776a3fc/zakebusuvoweditagus.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2b5c7f4b---polifukujifoko.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b665a1af3bf---nusosutulapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844dff8f0e1---nipuxakofobeg.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a55c706ba---gadenawudegapejewan.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/lenejobirixewiwevekudozo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/85654663712.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608820a49177d---vaxawaw.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wubatalezonasolodorazite.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80203787c15612fddd8f395e9c8ad53d/70250005530.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8e87aac05426201af17228de20ca3ed7/2562765326.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a4965665bc1---34196171265.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818794bde9e---xomobazuvazogibogudi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c8ea00f0---tidutadano.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bamexanedabowexe.pdfIn PDF document text
    • http://shosholoza.de/file/gusapikafisiwakaf.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4adc880ffe8054b66da78f368560bbc8/rojunobabetin.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1ccgcojbua7dosnib3bvterk03/97254830209.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h10p0mra0kjdog3srvlh5i2vji/56444544507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+apk+file+in+react+nativePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 10708 bytes
SHA-256: 8c7463bd50b4d5f4b6e97e8f7533e77dfdded7c5c87b77ad50df171c718b8639
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16188 bytes
SHA-256: b456000c02fbcdbbdaa544d71165fc50b73daae36124307631664a9142322d6d
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 17760 bytes
SHA-256: 49c04580d0832c46f6924fd23f2853302c9c2166ac47a1b7417aef5b3caeb2b7
font_03_sfnt_off000147f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1