Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50c4f6110f5b43c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 20:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a5179ec0407459f0c6f27fe7fb20cbf SHA-1: 28330edfb199bc571da666c78000f0b09319d6db SHA-256: f50c4f6110f5b43ce009532758a37ace390b2b238fe67c9f9b9d41d859bf55d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The embedded JavaScript suggests an attempt to execute code, potentially for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hopclickhospitality.com/scgtest/team-explore/uploads/files/woruxepori.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1477e3f8---86965801432.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b49ffbfd9df28ffdc3a8bd6ed4e82651/36293685795.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/dezugesan.pdfIn PDF document text
    • http://medrea.ru/upload/files/banolanarenan.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/35049011385.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/povemopanukatenapexaximar.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/tejeworomono.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/gulenigubog.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/gofukazo.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/25167345237.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cc7f3e1d08d0379a99ec66a5bb590c5a/jinusixegoredukojuga.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/96090403156.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/sumobaxixeminuwoxa.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50bebf787---63731922689.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/93220537151.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/kimunekadidatusomaxaxif.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/63397016218.pdfIn PDF document text
    • https://purefeeling8.com/data/file/pelokiv.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rafoberorir.pdfIn PDF document text
    • http://davcpundri.com/css/file/58248258495.pdfIn PDF document text
    • https://photojet.net/userfiles/file/pakemiberuxonazi.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/6967415745.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138971560f29---90512147127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=famous+volleyball+playersPDF 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 10516 bytes
SHA-256: 49f6ecc74fead95ea9a6e558d1273d1336acdcf31ae53cbd58cded06b5e178aa
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 19048 bytes
SHA-256: 0cb5cf6369847515dc3a9545dc709f52dec568d2e4a0902d9c066c9e3cca5b3d