Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f685dd9cb0ef0a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 23:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f292caffe0e7da45dd085241b83dd4b SHA-1: 750ea93c3fce117b40ac495db7e8223872cb4cd9 SHA-256: 98f685dd9cb0ef0a8d2c01faa31d57c5785f1fd22fb487cdb05bcb73d0b313d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://praktijk-fix.nl/userfiles/image/file/muledenititotiwi.pdf In PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/zimisapugup.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pejobudimeduvoji.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/68343853773.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fenerejosikotatix.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210916014617.pdfIn PDF document text
    • http://thongthien.vn/upload/files/vigapa.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/reropovagemimusu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23391873296.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/popitokopexutejimixebogol.pdfIn PDF document text
    • https://preciseenergygroup.com/media/xivubuwevakoxikuxon.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/67423621586.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/23883932793.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85359a5e4---12116511690.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d592fcd417---7255289832.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/65097307176.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/zipawub.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/33535648687.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/mipigugerakotimu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a58ad9685---tisatobodutimelalezug.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/taneleputuriji.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/6036695692.pdfIn PDF document text
    • http://xhzhengli.com/upload/kadog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+use+of+dropbox+in+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jazovesebokedak.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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 17344 bytes
SHA-256: 596bda72de0f247357a9019a6bfcf5620fc1ef88d4288d106d08deefe6a36e88
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10884 bytes
SHA-256: c39e9bb7006a6c31b5886793c119943957dae4101e9bdf43ed8b3199d066374c