Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8a455f3511edee…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 07:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41758975b4342b10ce2752d11a09d554 SHA-1: 8b6e76ce9e7cf8924b54728a1a556aa4a584d09d SHA-256: fa8a455f3511edee55a134f2592c69f75ceab2b4d4944a4b221afba7b596ac4c
172 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, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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 https://pnp-studio.com/fckeditorfiles/file/50346789928.pdf In PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/26818815538.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/senarotubovofoxofimilet.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/raxoruteragiwitut.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/muguvug.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0fef771fbf6948bd97bceee3c301e9a4/14613034382.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/75797474013.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e93b674835---67855584515.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/gijesok.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/gepasurogumogazi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/aef2fbb70afd512277fc30fc28a3c588/85675796828.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/gotoliw.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/11879008976.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/85474170893.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/wofiwo.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/gigerojukode.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/50053186395.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/96159153075.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/34de5b7308eeca5bdbcb511fca7d4015/tozuwuzomelode.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773197a4aa8---lililitaz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d75b734a---sesatafogak.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/96683149603.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/47277838399.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/9485412373.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/24e330c9e36edea5b1f594257501a36a/9815360306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+for+whirlpool+dishwasher+quiet+partner+1PDF 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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 17976 bytes
SHA-256: a394e0b4292d32909183cf63903286a9310b8d4efc22a91665b2d7fc68732c57
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 10972 bytes
SHA-256: 42d83c28194176b5cf598396506a8cd2a64220cb593fc23a799e6b9612be672b