Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d2fe0399a5ef53…

MALICIOUS

PDF

90.8 KB Created: 2021-07-23 05:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f4b7429e3a5b1b8d95f8c059ee10413 SHA-1: 023039fba21e112ba7407de87bcd922e577fb787 SHA-256: 79d2fe0399a5ef53d8ae3c2a5674f58da015cf22bf28ba2bca9ac8d1a85db031
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k8nj54u1ppgstqi8b9cij3qg6j/16442658941.pdf
    • http://chinahongji.com/d/files/47657178004.pdf
    • http://safires.cz/ckfinder/userfiles/files/kedagilepijolavegutez.pdf
    • http://bajcsidavidfoto.com/_user/file/wemidefomaki.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3cb81acf6---nozeteraru.pdf
    • http://bluenanum.com/ckupload/files/92060887091.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210701_407955743258E001.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/70ptceggq1cooauf657alhb2eo/firajosavuxu.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1a40bf5631b529f53763d23d3117f3eb/lefobezaxu.pdf
    • http://ca1970.com/clients/10044/File/62700066654.pdf
    • https://indiantalentjunction.com/milan/media/8116975635.pdf
    • http://mopi.eu/ckfinder/userfiles/files/fusevutabaripatozitek.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j15p50f4vvhhnuecccl72fohl7/xibupirifukotovirawuzo.pdf
    • http://bjsprt.com/uploadfile/file///2021062417380470.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/266a7bee0441fbcf094170035e8c6869/bakonapevejaridodevutekob.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7d8e3887---kemem.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2f740818677d01d923ed3e91da3d1e4d/xifilemelajimub.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ctpl7bjd45e2qfu075qoj4h10g/kolijedeb.pdf
    • http://belgium-ex.com/images/blog//file/69873047340.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4dc9e31d3f643a5581c6bec843223161/61718986919.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760fa7e34---66729297295.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shih+poo+puppies+for+sale+north+east
    • 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_off0000ff13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
font_01_sfnt_off00011725.bin
516ca8b9527fc5dea196a2f64658247f66ec6a489fb3917b2a5734427ee98a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 17428 bytes
font_02_sfnt_off000144e4.bin
3737fa733abb7c5d300fcb252099697d85810ef58b791cc042793024c677b586
pdf-font-stream PDF embedded font (sfnt) at offset 0x144E4 10632 bytes