Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22274a338458909…

MALICIOUS

PDF

91.2 KB Created: 2021-07-19 16:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3fafaf915a3ae0a2592d9833f741b5f SHA-1: 8411ad74e5f254278c31d4fd99a1941dea22bddb SHA-256: f22274a3384589097c3c9bc75b7ecb433a27ae1a4f2af7a21158162915b03c9a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/hji8n29ivjjsd153lqfqdiu6e7/66016918371.pdf In PDF document text
    • http://mixmarketing.vn/upload/fck/file/33283712918.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tibav.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/pemisoses.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/roxanob.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c16b1dc4e---jobomavolikefenobujasifa.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/017bf23d0bb91e4bb0d2ec3b274dc110/28351981032.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ac38a40d062887dc6f3cd773203a5f9c/58736656634.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1dcca68323fb64080b66b6c5850c8c5d/domugewopiweki.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dipusorebumu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c145c9689caac9f25cbea9b00191b0e4/fidijupapepefu.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/puziponapojugitoseza.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/85876255841.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e2fc98c0---18350389866.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed804c216---jorajupisezexasazepulu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5693985592768115198afb94fc2a6703/zijipokabawudejobib.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16243564844429.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4553bab6b7f6a53a068536a52a4fb33b/rinaxalaxuxomorilezow.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/43806187738.pdfIn PDF document text
    • http://vodnik48.ru/content/file/rupugewaba.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c517a00fe68---57457810232.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/zoxomobabivuz.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/afeic7m2a04j1p6c8m5cbci674/lufamufavof.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/918c4e9dfcbdf574ac5864837bb77859/50882246646.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/zipidusejuwivetuwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+create+a+pdf+file+from+word+documentPDF 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_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10792 bytes
SHA-256: 353f81130a9a161fa3094e735228de2ee00c0f272a9ad0de4a2286ef8566a180
font_01_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 17572 bytes
SHA-256: 7f836be2a030157613159e5ff160bf98bb87f1e32684f767d51e687e8f44dc03