Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b258c508fdd388…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 04:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba8ce5171ae7a61153dc42841fafbd9e SHA-1: 53bbcbc186bbecb6ef7fddfbdb342cf7023680a8 SHA-256: f8b258c508fdd388b109ac065fbaf56a80ddc922e17ea63431daf37c79901fc2
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common tactic for phishing or malware delivery. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of these indicators strongly suggests a malicious intent to compromise the user through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bfr-bialapodlaska.pl/userfiles/file/bodafobomuf.pdf In PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/zarewudiworowojeli.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210901051955.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/bulevad.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/16675673505.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/316b203eaa28ac146fb865aa062be980/sigosodilumoke.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/71320410503.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/gekinipubijinikulov.pdfIn PDF document text
    • https://lapakunited.com/contents/files/29355546203.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ee009514---gexadapobewuxidegutig.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/88387015450.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/65180857650.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/xosofoxenizax.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8ae7cec5---55934803008.pdfIn PDF document text
    • http://suurelepa.ee/data/file/mimamipomupipepigetaxa.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/dadubeg.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/37359030851.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1645473255612ff6e502cba.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/77600943691.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kokifavipanuvunanojig.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/43045246859.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/080219333303.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/gumoso.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kitalezumapajuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=transfer+messages+from+android+to+iphone+after+setupPDF 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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 17508 bytes
SHA-256: 4ac8b94b2c43d151614698495c6b56127cd31b9c64cc23a82068be2d90d8a71a
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10964 bytes
SHA-256: d6139eda326641ad6a4ff84237292742ca88b7cc07db27c8419433c80d1449b0
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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