Malicious PDF — malware analysis report

Static analysis result for SHA-256 759f77375de30341…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 11:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c591a8bf29fdb59237e8c727eaa05442 SHA-1: 7c8ca191cafa03c3b746acf61f6eac59e3febafb SHA-256: 759f77375de303416b48c85597bdc6c2f47bc132e012685d283cb6da6e356f30
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that redirect to various external websites, many of which are hosted on disposable domains or compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these redirects. The presence of multiple external URIs and the overall structure strongly indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=house+flipper+for+android PDF link annotation
    • http://ledspectrumthai.com/ckfinder/userfiles/files/movosejetenazoligej.pdfIn PDF document text
    • http://surtek.biz/image/files/20150330_063745.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/39428733981.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa0f7d0cb---46403906439.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/37079557399.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/xevefuzet.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/57114337386.pdfIn PDF document text
    • https://hoavily.com/uploads/files/gumidadadu.pdfIn PDF document text
    • http://inica.org/files/file///fawuwitibilolodikubuxager.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/zusopom.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/11889959206.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/97244827003.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/32213933678.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/javavupuk.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332b6c5f96---pisux.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zivejoxogegikux.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/defizefinexifarasep.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bosiketeguxezezerezavabu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/7581747580.pdfIn PDF document text
    • http://guowangcable.com/d/files/jilotaxapunuxu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/89513808037.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/73468113100.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_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 17552 bytes
SHA-256: 1c97741627ccb6babe75c75ce4c79db89089ecc806e3bfc9d0be931893412469
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10484 bytes
SHA-256: 246d0197bb3168b0ffc4b0ce90eee3012e16a7e8e36f70bb26bb6dca857a3d65
font_02_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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