Malicious PDF — malware analysis report

Static analysis result for SHA-256 944a95d1da62c359…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 09:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a0beb71be27f93d39a1bad7c132be3b SHA-1: c64f8ffd9117db4f621128acfac1591714ade188 SHA-256: 944a95d1da62c3590f5c47560a4b49e17b149c4fffd9c4f44973c99fb8fbd9b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kajasazaju.pdf In PDF document text
    • https://magerp.org/upload/files/40644416535.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mopovowepixijufarewoseri.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142675192905---mezorajozadopirugewak.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/nemifax.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/84757694044.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zofonageguwukibupuzafukij.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16317648152425.pdfIn PDF document text
    • https://t2sc.me/userfiles/13608131848.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/44465435579.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zopujosuwetozozimokuwaw.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130817018883.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tipijasojukiwafotomonuma.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcf49a064---teralifakukol.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/xalexiwapojofogabezinov.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210914070214.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/71786063800.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/66825038259.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134feb32bdad---mabuzugofiwetofa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3cfaa6ed---69533711455.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/90202056572.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/15780374547.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/xizupifubomozomatimik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=app+for+screen+overlay+detectedPDF 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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 10680 bytes
SHA-256: 61e6b56e70af8618267b6dd173ae9a1533195c9c038785cac1a5671a2ccd1266
font_02_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16624 bytes
SHA-256: ec0d989f0e889704f1fea398d1144f415a54f4721f7ebba436001f21e205e3cb