Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b96a98acb403268…

MALICIOUS

PDF

92.3 KB Created: 2021-09-08 19:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31be6e051f21dd0bda883c778162165f SHA-1: 8792f3e72e8f87ba200bdbf4f1aa53127d87067f SHA-256: 7b96a98acb40326887c9938b22c80606302b222cef18c302f31ffe29bae6e09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d17a03ba5---14909976372.pdf In PDF document text
    • https://mytopics.it/uploads/file/15055956695.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906091014150.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/20619536095.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/9201079860.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/97364432336.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/nekogokodulalufitab.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7d977ae25e6325de52082bf2d50c295/lagurilenapokuxuwadabekop.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sedew.pdfIn PDF document text
    • https://inarsindbari.org/uploads/53690918777.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/5754858312.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/83585123506.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/misusudat.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/kofiparexisabojatom.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/vonizunafugufusepeku.pdfIn PDF document text
    • http://mp-journal.com/media/file/bararujeralexewuzija.pdfIn PDF document text
    • http://speckrepej.com/upload/file/46109105059.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/27414253225.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135980f99931---71180051902.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1c93f52---60878263929.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/fidonuwujefigafiz.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/romubenet.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97408233682.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/pezazorafaf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4ecdcc6f2---71987130024.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/velifiwukefironefemujon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+multiple+pdfs+in+one+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_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 10692 bytes
SHA-256: 65c3a7d55ef73b6be59b8621066dad3c68b0b7b15a3dae8b133b7ba85c38cf92
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 18380 bytes
SHA-256: 06a57f9e2d226a334af8a581e19e57ed7483ce292379f249f64872c77a25fd65
font_02_sfnt_off00014b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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