Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33fb86129630b89…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 03:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0947f1d0268460388cfe69953cbcf64e SHA-1: 7a15898472aee12b366b04240d2e97c0af6b78ef SHA-256: a33fb86129630b894b795238e45731ace57181c8310fcfa7c744b89309753fa9
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://infrive.ru/uplcv?utm_term=how+to+take+screenshot+in+galaxy+j2 PDF link annotation
    • http://osayit.com/images/file/gazexesonesaxedavudenugov.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/76512546881.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/79833867039.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b2f2bfa1f496217d4b8c7cfc65fd8a7b/51145130260.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/nususavuzafa.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/parosifibom.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/36072963882.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/wuvizufefifokubelu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367411f39aa---pedopidozanod.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/xigujapabav.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pinujojetegitexonuto.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c46f092a28---fepixisifolojoladevaw.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tinajimut.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/47198096492.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/63351537864.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/49316026963.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c35eeab2b3---21401967378.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a45d60610a536871987884b59a3018e5/bajezefanoruwu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219121351113132.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/10280373626.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/kedimosokuzevaxisedif.pdfIn PDF document text
    • http://wdnederland.nl/file/kufibidefoma.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/50039519782.pdfIn PDF document text
    • 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_off0000afe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 15400 bytes
SHA-256: 8fe63d67ba673098796bb43d1608fe9981715a5198cc22aa01e96ad01738ecc7
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 11144 bytes
SHA-256: f9a22c7802743547f7bec2088b34ac77c68b5bd7661bdfe6073527725c135d69
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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