Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d52b85e642af71…

MALICIOUS

PDF

106.9 KB Created: 2021-07-03 04:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d46246cb85319f4e73414c72b1a76386 SHA-1: efcbabdc64fce6971e8f6b4e359ccc2801f7309b SHA-256: 49d52b85e642af715cb025d03bdaef86ca3420b0d28613ae67f32cac00111565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users, potentially as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5ba29f09---xomazozepatovopazupas.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160901c8f82c5e---57594087880.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160854fe7beb73---puvuraxujepixesimomepud.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863d09c2e15---44086501792.pdfIn PDF document text
    • https://securitydm.com/slicice/file/35367760434.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/8146079810.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cc4e4edc---wevedevoti.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/50334382093.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/zipopit.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da4111094---25816941789.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d72a9b6b---98814042681.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884080d2639---7326826769.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4843dec8b7---87014615079.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/dojatuxare.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7413ee5bf511fb37ac09068310c40a94/zudibupixukufew.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70590bcd5---rovor.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/36038787961.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092abfe12f5a---76566043699.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/buzogozitifidiwusalagem.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/lekeziritinonekefemufo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81583314735.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/nepis.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fbc6f02064a15cdcf36676cc7acb3578/musotezusovad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pedicure+appointments+near+mePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 18384 bytes
SHA-256: 32622f75d7154c4f421060382dc656c532468db11a451acf40e25c02c28ae3c8
font_01_sfnt_off000157c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 10732 bytes
SHA-256: a6858919905eeba2ad56ef4d30530abce6d645f0c54aa73ef9456d43e0b5e860
font_02_sfnt_off0001706d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001887e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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