Malicious PDF — malware analysis report

Static analysis result for SHA-256 d785208c5e9323ca…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 00:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea856a96136ca3bfc4636a9f8af54c0b SHA-1: 4f020c63cfc3a8e7824a005dc26f7c64185df4fd SHA-256: d785208c5e9323ca4f1ed2de624c0fa7ae9c60dec6851e7a94bc1c1d1a73964f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/45928936349.pdf In PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/sisowut.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/n6sm7nf5mma0alhjrfomf22ei0/bofip.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4qg72099vno7oahg5f6n6tuub2/vupepajebemesevomis.pdfIn PDF document text
    • https://digireg.pl/upload/tokisebibowetawuro.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab726cde448---bovosimob.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/fukubi.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/vevevidowikepunitos.pdfIn PDF document text
    • https://nattasampun.com/upload/files/44243246261.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/25518394383.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbaeb2bcb2---69301025500.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/xupewi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/86001079101.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/57604290652.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7bf7881d58f83280f72ea94229b4739f/begowiwemazuduwaraxene.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/febavirogeguxaxi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xopadegenigamerer.pdfIn PDF document text
    • http://mutitar.com/user_img/files/gafunibarafuwatikado.pdfIn PDF document text
    • http://kbchina.de/upload/toxunolojemeviwumawo.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/56309664495.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/dufinuzikaximopojepow.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/91849548002.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/91528154464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=imperial+march+keyboard+notesPDF 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_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 11076 bytes
SHA-256: 9593da7500957f0448c8756b1683408f072721fba3c020750fc5866c54786508
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 17800 bytes
SHA-256: d6b9f609d2c89913fcbea37168ded6c9d3aa5342faeb54e7b99ab309d1d3a4e4

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