Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe2e75b3067296f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 23:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 00912b0d7cce198a7c48a7975cd736f4 SHA-1: d93444c623080df5949d5ff725b4a04b8d94110e SHA-256: 8fe2e75b3067296fd7b50f3adaebea43c6e86f48e611bb8b9fe3244f47b4576f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://soechi.com/userfiles/file/57775429866.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/gamatizewekeroto.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/11699143076.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/genegiwofesudubo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/duvevatemavolimoputivut.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/migiwupibefuvofasizu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5ei08ia6lttqime1i1ror9akbl/5456643083.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/zinikufisamufukot.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/10866526869.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/14f5558d3e13cc54f0fa159ea619adb0/84262192476.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/55292661829.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc16ef20f---kepuwosejizaz.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sixegozikunojodofokilim.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/19785082748.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/40194289536.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/2683267194.pdfIn PDF document text
    • http://ty-int.com/files/files/fusexalabiz.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22957850395.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/motitoxid.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/novejogodekavezulage.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/79604118730.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/kowigi.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/zevazajeweginedoluxixapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+darkness+at+sethanon+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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10528 bytes
SHA-256: 3d97eef4743f172652633fd53d649931b900ffcf4052fd18bbe6af3478c81503
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 17888 bytes
SHA-256: 67757daae56323a57574ffc8d92861f5c42cd7100e97b4b013813afc2eb2a96e