Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db7fb3679f52d79…

MALICIOUS

PDF

90.4 KB Created: 2021-09-16 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08af34e4915cebe2f7833527a2318bee SHA-1: 1cebbfb3011a6840593ddfcbb9f481852c9ef150 SHA-256: 8db7fb3679f52d793cc44e24693b1977fcd54ea244a6a7af9d3fb75ae038e4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/96792540289.pdf In PDF document text
    • https://karolinanowak.com/userfiles/file/71799377406.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/92010825219.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/29898965257.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/45593598078.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/lutapor.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903200928.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/28063286393.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wowonumugosifajevusisax.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/13093619967.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b52a99d38---63154996507.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f910c23a1d---rugezatisatubuvarepukeju.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/maxokixasonipasez.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57ea846bb---90496333156.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/15849321982.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wajivoripipakubomagugi.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/41206740029.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933337728e---xikivesim.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///864083074.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/surixorobujeziwedabukinod.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142a284e6c95---tuwisosoruketarokurape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=full+movie+after+lifePDF 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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 17228 bytes
SHA-256: 03760019a4c4ddd378a5ad13a9906f755d4562a5a81e639955fe00fe7d9feb7c
font_01_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 10248 bytes
SHA-256: 4300b19acbcde8cc4382a52e3b38a12acc848ca0f10dda23ce8d940f2faf10fb

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