Malicious PDF — malware analysis report

Static analysis result for SHA-256 daba1c4401b3c1a6…

MALICIOUS

PDF

73.8 KB Created: 2021-08-14 09:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d1a4dad0b9a670175fb03937cedb759f SHA-1: db57999a2581079678ba2f6db6e0b69722b46e33 SHA-256: daba1c4401b3c1a646caf6feb3b3562f28947d932e07572645a29647ced8b3ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=libro+el+rinoceronte+pdf+descargar PDF link annotation
    • http://thessalonikiflights.com/files/files/18792685610.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/gopokanudowirexefinaja.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/67745020004.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161146946d927b---16137475572.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/jabubojuripibamewabis.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/89881785702.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mkfoss5cso2ce90q965crrjel1/44528603907.pdfIn PDF document text
    • https://ahha.az/userfiles/file/pupapumageluratogilijizi.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/boxoderepupaxe.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/gapexevagetedi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6468b47bacdf530079d0fd29c01f8f0c/22918189082.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/67289596274.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/86511099795.pdfIn PDF document text
    • http://sdds.be/userfiles/file/50631220116.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/zufupilipajogezajir.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/tuzogi.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/14107615368.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0ca56794245991a69f0ff689c9a035bb/12697056267.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7lrhc43r51v82dfq70ec0gseqg/kafofagaxetet.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070474165145---97752416992.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/vifitib.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160989ca9efb70---kiluramopikuvofupe.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixuxedalipi.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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 10892 bytes
SHA-256: f48f23f098e1843fb198ad9c7ce7e26de101f7b8878e54bbc2f0a475f1e46858
font_01_sfnt_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16488 bytes
SHA-256: 4e848e2b4344f49ef8d82db3953c8ec1a8c8af5a087a3a072a64aa29b352198a
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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