Malicious PDF — malware analysis report

Static analysis result for SHA-256 59038b3199bcaa80…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 22:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 236b18c4f990ae570df1a62b3d3c29d3 SHA-1: faecae484aa9e2fa181dbe8ac2a343d5f1a573d9 SHA-256: 59038b3199bcaa80ae03911353bf03c577e0a062b39d1ad711e6d970443f9969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea that these links are part of a campaign to drive traffic or downloads, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=verbal+ability+pdf+free+download PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/koj123tdt70rcnjgntnl2fm7tu/jixibepojagaderamimuv.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zimadagasaru.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8cd6eb68---vepusejot.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65943a0fa3---19068225302.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/86689174482.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/76042827709.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/fb7608e162044b6d44169819581359e2/detigum.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4903e7511---degiporudedogibexab.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce268de0f6d---mamokofixedetitidapukiku.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0184d9d9---32931355350.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0af704398da376fadb75b76280f7ef94/xusubobekiwos.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3188614af328ef551340a3e676d7540f/15428999617.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/87217938026.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/saxoxibegimon.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8ca7a628---18329492687.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1k9uge7ica9tllj16939bqchmu/56649743366.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e955e151d3fac5f72070a571977e7f15/wusupibewa.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47162afadf---dijen.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2735d3275069d3dd13876fcbec26c574/rowuve.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/kumegigijajogokemizow.pdfIn PDF document text
    • https://bnovum.hu/downloads/46505902436.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52c5328a0---zaduwi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a840e6c---40675576942.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2d025341---95573875066.pdfIn PDF document text
    • https://beaszemin.com/files/72161962202.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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 17388 bytes
SHA-256: ae9c15ccdea9f0d8871973f3bd426b769cdfa89872151b0def472cf22a3ca111
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10632 bytes
SHA-256: 8e7425e8e65e4f8237f0fe11bacd5248bce4e7607bd8675c2312b3bf9dfde9c3

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