Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e3f32e5f9c8ce…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb98f4e9c6db527b601ae7ab39539f73 SHA-1: 9b3665bf9e58a4de0ce990d0e0dcdd896e079796 SHA-256: c73e3f32e5f9c8ce7f600d022afb438e1fb309c5575981f5e277d2e817d51177
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery secrets or private keys from the user. The embedded JavaScript likely facilitates this phishing attempt, potentially by displaying a fake input form or redirecting the user to a malicious site.

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://fine-cottage.ru/userfiles/file/91933327940.pdf In PDF document text
    • http://to-kajihan.net/js/upload/files/81799961322.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/witejimeganitewatevulid.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/vuxavijepupiduvefi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/kilomelufavusimifibevud.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41111097091.pdfIn PDF document text
    • https://jambumanis.com/contents//files/26957645799.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fh3669l90p0lto70vtmv8j7mu7/78152381811.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/40506377804.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b588e77e2f---savurogobemuwe.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bd44bcd84d4---89228599739.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/2poqq8kdo309960sqfprr1tbg4/lunikixisitixosetinarepuz.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c51bb6d6---zaruxesugeleras.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d5719373c1c---nulugunozi.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/dezabetuxukifosoj.pdfIn PDF document text
    • https://actorconseil.com/files/file/4848915393.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9963a8dd9---fawekomuw.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/filixisufazeli.pdfIn PDF document text
    • https://cristalensi.com/public/File/44898119859.pdfIn PDF document text
    • http://orthopediedelft.eu/files/lapewowokorijanazokij.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/sugazojixinozajezavu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43eea15680---67546250830.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/37339037407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adenitis+mesenterica+pediatria+pdfPDF 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_off0000b5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D1 10596 bytes
SHA-256: 5bf6d3bfdfdff5faa1ee6a8e5b26caad8fb134adbf655f5532e189c9817b1736
font_01_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 17888 bytes
SHA-256: fcb5f3cbf56139794496ec77fb5c28a67a4b2385490220365e0e06c3f7ac56ce
font_02_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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