Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2071900edd8ba9…

MALICIOUS

PDF

110.0 KB Created: 2021-08-23 23:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d356ae0a53d84d888cbb9075c74109f SHA-1: 48fb9f9290898657ac51e34f57ef8c235a575aa9 SHA-256: 8f2071900edd8ba94c78e6b4234e5456a29e6097532d2a73f9a8fc4fe5136866
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and 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. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://paklya.su/design/img/upload/file/99899983579.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3dbb9771---pegesodofejulodexofuzub.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zegokixutesuledazar.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060208189169.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/35664384456.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/29331637474.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/gufad.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210609134907206790y7cs7.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/17139230947.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pah6s3csmtl00aq8reg379hdj9/romagapadenizev.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b41c03ae1---guxeged.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wibuwomo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0103592001621912032.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf7858885f---37279752355.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///namawigeloremijazugutulul.pdfIn PDF document text
    • https://ka-base.no/images_students/files/87718899298.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/tezisemibunoravawuwirufur.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/86954391236.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7a744ba9a9a14b0869aaca8b571bd431/rawadin.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8f6504d5---fuligozafalor.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/lenemasolunusa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a1df919aca6a605c6303793b45162ab0/3766062077.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/88207976240.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/suxiwuporojujufitexukusux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inferior+rotation+of+scapulaPDF 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_off00014314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2B 10524 bytes
SHA-256: 57152676031b3c8592874291bab1b3a4e7dd73292a9fe5974ab6fff2a2a771df
font_02_sfnt_off00017340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17340 21448 bytes
SHA-256: ac36c9fb19d1bd55b50ff8b3c34451901d85636d3ccca69b737f3ac60be65c07