Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21912bb0ec62006…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 06:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 616961c07eaa41a6903b1ead572d9a50 SHA-1: 1a5f02fb1850c93b04d302e7dab172ae9858927a SHA-256: b21912bb0ec620069440f12b2cbb6aad08db7fe8f956d1a9767d85253a11a11e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af79c3f0f5---roxafigukojutijugabojala.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f458677---renufiwilogewopixapel.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/suzedimamefiboba.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac590866da7---46298620682.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/62935329455.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/lizava.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16105d6e1b3648---pavakerumumalajoxaran.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160994b4165c3c---2717182159.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/cmsqvr5qn93mmcgpf83fao1qss/venesolenoni.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd40e701f58---9361203817.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/27bbd3030f4e154487345f61dbb68bb3/dazipoximenifasekesow.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32bc2af21---gebozexosimofe.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/71030427966.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/12196622250.pdfIn PDF document text
    • https://orangerun.re/photo/files/65752969451.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/gipiveratebepaguluwufowas.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/sofokalanalewibojukiza.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/wadape.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/76474143756.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ab71be0b---19685300682.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5d22f480629d5f36cef610ab3b4544a4/kixofipip.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vuwibufibajivexosewufilaj.pdfIn PDF document text
    • https://jagominum.com/contents//files/24544790354.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609939ad4f31d---99873584337.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fozaxekivuja.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/segad.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b438b10a6fc---gozozidusibumojuzaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=force+dark+mode+for+web+contents+androidPDF link annotation
    • 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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 17156 bytes
SHA-256: 45e4ee2caa56c7ccf2a0ec05e1b884d1cc46590c33078788f2d0f9da20eb6655
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10888 bytes
SHA-256: c3e3a90a93ccfa93d8eb77d78de26e6c7045ddd0779a6aee771b0a331872694c

Open this report in the interactive analyzer, or submit your own file for analysis.