Malicious PDF — malware analysis report

Static analysis result for SHA-256 333372742b3adc99…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 01:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fef790816024ba1c8058eb023f993cf SHA-1: 97be028d514364c36c4c844c713475108a7e2d47 SHA-256: 333372742b3adc99e76a8acaa032fb0d4647f53ef4893ae34bb185ec91fe2c62
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a malicious document designed to lure users to external malicious content.

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://radio-salsa.com/php/rs/filesupload/file/figerok.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2741a4e61d2bee98ecf57f5b20fea777/96319540470.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1333edeca---46077144187.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/daspjadk5fleacdmo5pfa5kqi1/rikunekugaloresinumufaki.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/38658646487.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/56712668459.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/1921999305.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9bqtsh1f8d6ru6p97biv4j8urp/wuzujarekan.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7288e45---fusolubedixoxep.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/36900885124.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf739400a3---jejonenimagi.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/64203610241.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/92412410619.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/foguposakon.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16130af5a24f86---feponubapato.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sudeloleziwosepem.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/tepukek.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/24803239385.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911203138010.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/10787560556.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/33510519430.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120713246941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+print+sizePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 17104 bytes
SHA-256: 4fa516a1086976af9894f675404fce17f31556e0b0eeb733277bc9cab741a3b5
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 10224 bytes
SHA-256: d794eff4157115862b32d3a31c742fbbd0d39a133e46293b424c1ffec7933add

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