Malicious PDF — malware analysis report

Static analysis result for SHA-256 90367eaa089a77fc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 421e534599fef61e0419d386054d78c8 SHA-1: c50a0d43954327bad6bb528fbc4881f0ab95e682 SHA-256: 90367eaa089a77fcd7a546fbf5a042739aebbc528fe24bb5668d858213380723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or direct users to specific content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://binhchuachay.info/Images_upload/files/39011343427.pdf In PDF document text
    • http://ballmillfactory.com/d/files/57114284250.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nitogedetexiwobudir.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tinunowe.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/popatibabakerowofu.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/56806210456.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/44278990280.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/71434175536.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/96511256977.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/fasefimuratuzudik.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/mogalawi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/sitowupuwibavigedupefegi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331d60a3c0e---26826984353.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fataxe.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vodemegegasiwofi.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/nesabeb.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/17478193576.pdfIn PDF document text
    • http://mamam.by/upload/File/file/nudebi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319e43d0d43---rejamowoxinudowemeluzo.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gaxipibapetug.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/xudevozadifawefimokawidak.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/60620094187.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/9414911662.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/5289053692.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/35884616658.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136297e6e046---90974254362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=justin+bieber+feat+songsPDF 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_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17840 bytes
SHA-256: 88795d997de4fac7df11eb96cb888394d5c5a36a2b34deebed2ab627be89e624
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 10572 bytes
SHA-256: 0d54000ac2add7fe3fa0d21b23834206a919fd15b00894a35a3f042e38e461b7

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