Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9e274fb507f003…

MALICIOUS

PDF

85.8 KB Created: 2021-07-29 21:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 768899892c951cdfabe654974bb0ba8b SHA-1: a80b2854bd0e1e1eb1a698699424860742c8df1a SHA-256: ab9e274fb507f0033e20b9f6ac2c4d23d6d8a14765268cfbaa73f4bdfc0c7206
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://peaceinsrilanka.lk/userfiles/file/mazipow.pdf In PDF document text
    • https://chinese-wall.tw/upload/files/33195740474.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/jesipo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4690cc5e4c77286e4cac0059f81683d2/gukotawawulalo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05658c59a8---toparerunimokirurabiboke.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/labonunuziwimikakemovo.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/76456325137.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0fme6tmv8s72kb5tsupm422hqg/76793830597.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b8hm2rio2578iji892d3rvnqt8/dotapejoxufab.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf237727eb---lubuwanexenivan.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/42hah8anst09gbsajaaqgb8br0/35616451223.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/91978e326a6fb367f126908336e8ebda/83465873214.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b11bd3a80ed---robobezinuzivefepo.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210703174636.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/gukalumakap.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lpn2glc42g86rjb4jle73ofv31/31210865439.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2960e0a26ac7c18dc451c5331af25964/xajeginatuteburuvefere.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea474df911---kulepifopilo.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/wejiriwaxa.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/32c95b27a12ba5b1636d288e473fa3d6/rowanagalufoxusilit.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/98895034596.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17024080417.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/aee45673a254bf5ebbfdf83f1cfc7171/48117609726.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bmdalt7e9ggt715h9pgbgf9jou/69050833079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=l%C3%ADneas+imaginarias+de+la+tierra+y+sus+nombresPDF 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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10964 bytes
SHA-256: 9023431249c0d54ea95f7af938e0afc38981e665b9a8240a01de1ff7b4264f14
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 18728 bytes
SHA-256: e0d5924979617edcbcaaaea209d13e3ad67c1c2cf4ce9b7d8e0227e649291067