Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bfebb5e8393d74…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 10:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60ea198ae7e7f40e14ea4c69c5e67945 SHA-1: de43bcc3c22145b1dfe7822e6e6f189ce2da3dfb SHA-256: 06bfebb5e8393d743683cba0e9ed9e28a81598aaa56f03e1cc90c507d337bea7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded links pointing to compromised WordPress sites. These links appear to be part of a link farm designed to host or redirect to other malicious PDFs. The primary purpose seems to be directing users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6800ac925f---funadasaxusobevakiwim.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/608bed42808223ef373099079899f61c/banasasipixabixanatipa.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e74a1d624820b39fdf337a887e2d165e/manijutazenobafewekuva.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/39211082212.pdf
    • https://petala.gr/userfiles/file/wemugulomiribajewa.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070025687da9.pdf
    • https://guijek.com/userfiles/file/76930587010.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ql886uj2k093qkm4tk67jgg22j/89067536019.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8a74dfe935c5dfe221551fd2957f680d/debutakabarevixadava.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf801a48bb---91165442574.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7580551b---23739832212.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c7d6b631e007ff6e85b2661741b2ead4/6371275217.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8b088dbfa53d2177fc5bfd1dad61dcb9/vegepifidupulonuf.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b2591b4e---56378951167.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/36526470201.pdf
    • http://cycling-software.com/files/file/9523947883.pdf
    • https://nikosdimos.gr/userfiles/file/gamorumepojadotike.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1251e7e6c14d40166fbe0887824f7c7a/24462898110.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6sd55ppbpbh6a688d4ugcb2fl6/jodilolusemevilufimu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814acba3b3---pixegi.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/q6d74m46c887m5o14jiofq9qbr/wudidez.pdf
    • https://natyabio.com/uploadfiles/25302003458.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781a53eb5b2---73548961750.pdf
    • http://angerdress.store/ckfinder/userfiles/files/93421764287.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=way+of+the+open+hand+monk
    • 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_off0001096c.bin
aeadff1c39da181d91c003e0455d6e45ae857421e59eee610967d3c3b4daeb66
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16856 bytes
font_01_sfnt_off0001355d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 16792 bytes
font_02_sfnt_off00014d74.bin
b3af1099aabcd36db95ce94a13c7d1440cf00e442a5c8184e49e6153b79453d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D74 10556 bytes