Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0610d99547a8207…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 14:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81ceaaceffa16f805ff676b540985edd SHA-1: 28ae86f173cf6e30e4165a83fce21dd2c4acb945 SHA-256: d0610d99547a82071e32bfb0a9a7d9b3cd01dc7466166f9df13db65949a5af47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on multiple domains, some of which are identified as compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://espokebar.com/uploads/files/34102254158.pdf In PDF document text
    • http://lex.tj/img/file/62258927330.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c929d4893---wasudodokirixasi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/nebisakigefoniriba.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gulebipedutodalom.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/54316809299.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631615453fb0d9d5649e7f6b2ad9d.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gugafofuj.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/31580809292.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/68145772441.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/31119126861.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/bizebulupodezuligejadubux.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/govunu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/belapemuduwatebo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/12050630897.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/lipikemivefuz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ace2fb13---sukowukafi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ea113bb5---28810467051.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/80730327640.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/veteki.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/tebuzakaguzuligulegimikor.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/86422504607.pdfIn PDF document text
    • http://hijoin.hu/editor_up/57612783817.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210925103408.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/susokejetasolirimebomagon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+grammar+in+use+pdf+free+downloadPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16736 bytes
SHA-256: 29e3d9ee9ab931f3eb5d768cf8a3d8189d53c505b185efba8ca02ec4cddb1027
font_01_sfnt_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 11100 bytes
SHA-256: c1088f5524fa08a6c18167a941a99c1546c448224852d634565036a21cadb95b
font_02_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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