Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7c5da5c4d9b4f5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 18:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78dc35a8068a2c7a70fe5f90b8dc6761 SHA-1: a3f7f1855f5d0c05524fe565069a5324a855172b SHA-256: ad7c5da5c4d9b4f5127203de5aa800c404d15f88a4b3e9d312d1dda6f7ae60f9
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL distribution are indicative of a malicious downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://davobio.com/upload/files/83921522425.pdf In PDF document text
    • http://classicalgardenfountains.com/uplds/file/wuzupija.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/pegokeradipujevufevexabi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/99f30d1fa820c3864f9126e26bd389e3/sewibajuzewonarev.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46a840e5603034de4222a2737b650e1c/numutegisal.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/tipanurorevegimusox.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716b73b5097---favolovukemu.pdfIn PDF document text
    • https://blokhol.com/upload/files/zalotapijunijakol.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/1415888793.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/55979590173.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/dawokululaxesedivirafibuf.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42723eab78---pajasurudawutanipalitinu.pdfIn PDF document text
    • http://delve-cr.com/uploads/lumugiraterobur.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4006a5f10aa78d45cbf239f5c42d6ff1/gizudunelasinovawar.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/80d3a4fcc7806ad46e1e1059c6a01a51/88175395373.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/3486441111.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/aef48f81b3adfbc9d8bf0582c8e5ceec/mewutowabudeve.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/givilisodaxisero.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa775cbc8---7920610889.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/009d0fd02e433ba6b902765afb99b90b/dosekafurofod.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8auvps81vr0eupi4c3ofel3fgp/zimegogifagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=anlage+n+2018+pdf+ausf%C3%BCllbarPDF 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_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 19168 bytes
SHA-256: dedd21178d514aa4cf765a2dadc69a220827744491629f08d5946ec3f21f2ac4
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 11280 bytes
SHA-256: 152f5331aeb0d1b9efe890cc746f5660825951dc162518b04dd7c36ecbbbb81b