Malicious PDF — malware analysis report

Static analysis result for SHA-256 3034b7448fbf34e1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-15 15:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94d5e128fd3ceabe386f224061fb44ac SHA-1: 634d84f06d21f09b345430e359fe3c462fd0788c SHA-256: 3034b7448fbf34e1b1837a5cbfba2b704feefd21c36d577fa98bb03c72e1224a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features multiple URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+recover+photos+in+android PDF link annotation
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/23320791780.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f2f116d041c9d1ca59ffb6314ac5cfd6/tufuriroxejosopipofuv.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/1930096444.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/netekemipinegeduxigizas.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/zuzegumupomakisukor.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/winisaxegosujexipetemubu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/30242871147.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/46297941788.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/84959500037.pdfIn PDF document text
    • http://airzo.net/userData/board/file/73072808192.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/70721991693.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904123254.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/27193349367.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/25479853511.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/34205299741.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/sudidepuzob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be43c2c860---luvetinivazomafidorem.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bf5b2e13---lodokudurov.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/17566271153.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210907104657.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/rexelepabope.pdfIn PDF document text
    • http://pronobile.de/catalog/file/66465402234.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9f4710ce18d0a301ff84b6571c9ce09b/79327669585.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/67924738033.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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 10708 bytes
SHA-256: 7c0aebc3bc726e1a8ca8080d09029e9482db50ee0a220f1acf3dc9e017542382
font_01_sfnt_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 14612 bytes
SHA-256: c744986c7e929ba6c382aa67065c5d86063023f43d9da515dcb520d01d2c305b

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