Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffa9f742ddac904…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 06:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 196adfa5320785cbca76bd7a9876737c SHA-1: 7a3e5db335d7fe311740c24507b56528d5a8ce35 SHA-256: cffa9f742ddac904fd6359e6bd5710eae3a8d020c8c0562af1e1c2d5d2631c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=live+action+mha PDF link annotation
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/repowegozo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/repubavo.pdfIn PDF document text
    • http://bluebossa.pl/files/file/94840061845.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/88160481678.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d90d2ad8---63057223937.pdfIn PDF document text
    • http://c-amc.com/upload/files/83062149308.pdfIn PDF document text
    • http://www.agot.pl/upload/file/pitug.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/jetojuronigizimisuforuso.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b393caf0---70052370608.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xowusupisifevural.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/filovunipijededela.pdfIn PDF document text
    • http://ahchala.com/img/file/8042568990.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/23286696941.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/79095500530.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/fefukigosifawikase.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/60357191114.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/voxazapevurit.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gegaboxedibasefelutep.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/73078484199.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eht4p5332q1glhgv8mco67j6em/73723900664.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/defufuzogebebitot.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac47f270b9---52385773673.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/rufimebuvu.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/64534047610.pdfIn PDF document text
    • http://zuche0551.com/upload/file/timibilafavixutuw.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 17540 bytes
SHA-256: 0f47f2379b1c5e05109ab5ae90aa594611b79c59ddb8c61250b697ca3948b55d
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10204 bytes
SHA-256: 993f4a4f0f2d2d1ac8f50ea1cbdf8c2ac016f08d04fb3cb7ae90409c97881108

Open this report in the interactive analyzer, or submit your own file for analysis.