Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d3650efce92fac…

MALICIOUS

PDF

94.0 KB Created: 2021-08-08 19:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b52afa4238b67c6f89053782a9e3668 SHA-1: 15f5bd036dd023960740af5af4ac41a7a88db971 SHA-256: 98d3650efce92fac32140e89f83a6ee885d6198c412d72a57d817f56ec82f4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://avela.md/userfiles/file/52602740101.pdf In PDF document text
    • http://stigstudiotecnico.it/userfiles/files/pufojamafogulideropesud.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/161806306532.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/71770021686.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/fipokol.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/vovabex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/96b1i2kpc9ammp83hjftnt44di/vofinixib.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/lirojenavumagegefakur.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/49899c74d221d4430f0326888eb85655/wevexifefejetipaforivuve.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210723_95DDF24EC0E398C2.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/73799926413.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/37328952347.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fc098d8d2eaed18f4b8c7bc2ad4715e4/23802159498.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1674b03dbf---20765838453.pdfIn PDF document text
    • https://flyags.com/editorResources/file///50115694173.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96c837ab690f4ced15b1edd743ece3c3/bilaterisakubuvewo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490f864e14---bixokuletaxabonura.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/38937265368.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/kotis.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/92238723973.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t8keahbl46284151kpttha6ima/16977147566.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925fa1dfd80---dovenoki.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/86521921378.pdfIn PDF document text
    • https://goldenapp.net/file/wolaleluge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=formula+molecular+acido+oleicoPDF 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_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10236 bytes
SHA-256: 99301759535b3783ee0f6c474db8270193c9b156a2d2571df072fe6f23254db8
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 18904 bytes
SHA-256: 1ed17f30f08f00a2c22a8d5b8ba6009bf4fef21bb821aa69022afb9da336c198

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