Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fbf8d286c155e7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 12:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 650ddb1ba0d6f0dc02749b2e778ecde7 SHA-1: 2efd30d69efb0ddcf382d248dca0e5effc869978 SHA-256: 59fbf8d286c155e79727964414720b4fc25f48913396e4a05cc6b6329eafb800
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The sample's structure and URL patterns suggest it is part of a campaign to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://tcsklife.com/filespath/files/20210906234839.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210908155423_u30ug9.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1d57025dce87783d2cd5c65d385902cc/72611171480.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/3934591293.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16142d28b6196e---nidigirudum.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/77534493095.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/xaxadigesugiluvagisened.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109120151092920.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/walonesob.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1dbaaed2---putubidanujamudid.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5008157747.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/20990929800.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/mudukukezaxu.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/74764242937.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b7f3c6690---16249868782.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce8776fb1---fukurekufakisiribet.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jivupozudizo.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/rulovovizilazenat.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/22607920089.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbfb4db22---gijatewupixulelosebuwos.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/pepakanetexakigakoxuzo.pdfIn PDF document text
    • http://anitt.in/ckfinder/userfiles/files/kisukawokapexaki.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fagapugeveturunodogi.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/xibejiwamogikopogalabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blocklauncher+latest+versionPDF 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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 17840 bytes
SHA-256: 1a9c1d42466c809680c97f2c050ce20fbfdae221d13ad4865cfddefee08588a2
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 10636 bytes
SHA-256: 75625f23e648895c3062a11df3ac4975e888838a244ec40929413554af69cd38
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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