Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cde74f1dbbe7f0…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 01:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea1fedf1f61ea8adf9718674e207dc9f SHA-1: 482c301c18c5602798c2465309cb55c61c018282 SHA-256: c1cde74f1dbbe7f0d01c597d500dfba98f9108239ea2daf3b669831f591e1bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to redirect users to these potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://coretry.ru/uplcv?utm_term=lesson+plans+for+english+teachers+in+middle+school+in+algeria+pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d8121a0d---28794093236.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160863bdf5d0e3---84006479135.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149c86ac72---labepofeperolaz.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a66c2f13b---parura.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/58c61fdffa2431bfcd9f78b0087c84b6/7330821424.pdf
    • https://rpdev.org/ckfinder/userfiles/files/19828307346.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a292c02af3f---97487597785.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/664cd39937c944ee2e5fc45eb420eab2/41792087140.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c68c82456---jofubasoverilisofebiki.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/epv5g46nmavcmck2c02kqb4pmi/51936218227.pdf
    • http://pileshoppen.dk/userfiles/file/35831904230.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/gexasikopomutulol.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a032a27fbcb---22201446951.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lskh5t1ippt3e89gvp7kel3d3/dufimadofovesiziwivi.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b477a64cab804dde2727d16bdfe7b14c/jiromunanijuz.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/64578222112.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b1c825fd---20293435141.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f0261d1154a07d43baa712fa651fb537/nuwuvorotut.pdf
    • http://botosani.ro/img/uploads/file/61956658727.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdabb330951---70877328039.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099c04962c8a---vukelakimafazep.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/p9l96mfroop5hp7lplde1om7ls/860223038.pdf
    • https://gea99.com/ckfinder/userfiles/files/30503947790.pdf
    • http://hongdanhaudio.com/luutru/files/62005969999.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089d.bin
cf8c9298025d2c3b9936330c178697f11bcda49149f5d5358404057a70bb9789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 18068 bytes
font_01_sfnt_off00013709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16792 bytes
font_02_sfnt_off00014f20.bin
722c28c145108c0b6355efacb0c57afe18d29151645bba70db348c2296eb25c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F20 11024 bytes

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