Malicious PDF — malware analysis report

Static analysis result for SHA-256 2169c73c602ab729…

MALICIOUS

PDF

93.8 KB Created: 2021-08-16 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3047ab1d667a3200b73eb525b0f975db SHA-1: ff8f62e77f12aa6801136b5a5a7384e6ca999e30 SHA-256: 2169c73c602ab729b1801cb0d4386b6475ac2949a83e8a79ca688d4b80c505b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/52751967279.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/xazur.pdfIn PDF document text
    • http://www.centralperdana.com/file/61202150796.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/joruwigowoxavudekudisus.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/00afe1981f06822cb17ace668652777d/7677333499.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c27gj2vcqes48pk4h836rorrn6/palirojusejonawotujivo.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nofeb.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/25515373354.pdfIn PDF document text
    • https://brs.jo/userfiles/files/6306628977.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/vatiroxevawatekovaxuwizi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3g3ujsg8gi3ksq7im4vb4jm718/21677134527.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161091ee91bf78---6955909189.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1a8c3e8a---6011058095.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/13531136055.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85122921125.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210727173602.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/94027918487.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/27601251237.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/javituwezoxudukabojow.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vixizopopog.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/js39969r6vm7js1qm4l4ln42nq/nusurilebupide.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/kesediraripoz.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/jowudunedebezujapo.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/89193754200.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lksevumckl9q42jvq4f8v5uu4b/lukivibofetixox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+reggaeton+mix+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 10832 bytes
SHA-256: 6767501876f6c95399792bedbe5f0801cbebfc80040c88d4274ea3620776ed64
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 16224 bytes
SHA-256: d6dd8f09a97dbabc13652295f0acfdfb2300323efe6c6ce91bb145bb9206f541
font_03_sfnt_off00012e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 22400 bytes
SHA-256: 2071f939e9c12b0c9c49944af0e7beab29f1f015543952c1ade3ca545059cd37