Malicious PDF — malware analysis report

Static analysis result for SHA-256 894dafd3a7578bf4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 11:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be48e9eaf39fa66ccde13a063174a6d6 SHA-1: 1f39b6a87d471fb94737b66b587f4245e6488374 SHA-256: 894dafd3a7578bf460e3c8ab8032d4b24d2b5f96cdc2fccd32e1039377f0b6e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=android+programmatically+set+style PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b80abe2---52181654657.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bu1khg9cvsifpjc6s5bcov0jn7/50885024986.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fivanof.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/popavavefuvanofavupemak.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/tuguriwisorum.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/15670850606.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/4647885965.pdfIn PDF document text
    • https://serka.com/serka/upload/files/56365827412.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/43899731887.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/kapozu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/delezepixumenujilifiba.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/62822317974.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/81571873862.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/kutesujaduga.pdfIn PDF document text
    • http://agavietnam.com/img/files/keraraxugavabifil.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090206125470554.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9255face32a949694b65a79ff7180d9f/jomilivuwozabutu.pdfIn PDF document text
    • http://skia22.ru/pic/file/roxepixejizal.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/70262492139.pdfIn PDF document text
    • https://denimder.org/resimler/files/73476315301.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/begononesurinesara.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/dd5cbd151688ef33b0fbfee5f7ab71eb/mikadup.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/sevinazaxudutazanifugomi.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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 17160 bytes
SHA-256: 6754cf5447f72e5771068b6c342ac7420ca7f12f71f97b584de5d20c38569b88
font_02_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10952 bytes
SHA-256: 413ed769fd88a550bb5e0a86c033c2e9d386179dc9e134ceba93dbc758b4138c