Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cea8716f8b53e17…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 22:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86347d66f8a626a4515e2962b73eaac2 SHA-1: 5ed5de5ec6ba9debaf272ef9c13f68675f4a91f7 SHA-256: 3cea8716f8b53e177e8c9652aa45f1d10436479b3f46184dbdfcf123583161fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=dungeon+hunter+4+offline PDF link annotation
    • https://noble-program.site/js/ckfinder/userfiles/files/vilog.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/37945116625.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/23626220312.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/88324817696.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b69712567---tuninegeto.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/65160007303.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae08004d6---87715059361.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/42486361780.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7731165ca---13193234779.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/48283841583.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/81855446757.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/sibigomadozilezi.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/junuwus.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/zegafifusoxofetiju.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/52357826012.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/913571a2f2aceeddd6894e7a34697ce0/rotedetatikuxiwivari.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/36743380407.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/84545419546.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vonemurepotowolokor.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42118207685.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16a0167eeea1625ff1f5dd4c379fb863/zurul.pdfIn PDF document text
    • 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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 19412 bytes
SHA-256: 38db1ee8dd1e4fe42c68625c1a57ba04db24f6934eac53db5569bf54cbdeb12a
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10340 bytes
SHA-256: d1260682851fffb4d6f5946de56d3ef3874f50775d40aa7e2e914c62143a0994
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1