Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7af00c0777e3e0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 11:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9d8e8efb1b399344774b86184f8291e SHA-1: 2fc54ac9d2156893168cd5b302444eeffaf081ca SHA-256: ff7af00c0777e3e09c2f80e3e78e246147ab065992cfe80ad83ca15b05aba08e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=watch+spectre+123movies PDF link annotation
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/gidazobaxikog.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a42fb128b---75536604471.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/7501664286.pdfIn PDF document text
    • http://stl-hk.net/userfiles/powonirodapu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d702761f6---jomidapebikasoso.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/notokamudezovibufot.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/lejemolisupatekil.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/17533130202.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/kisebezoxuzinut.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/70550363680.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lazim.pdfIn PDF document text
    • https://kokomanis.com/contents/files/siduxakitemekada.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/15182750975.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/5245996865.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/80054661681.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/83405406551.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/bumuginegipasasolale.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/25535862637.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090810183273499.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/81759339920.pdfIn PDF document text
    • http://bdn10.cz/files/file/64762423265.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d2543a5---34156724679.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/tevitelinumuxixobufabom.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_off0000b914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 10892 bytes
SHA-256: e9629a6747e1011e640c938b8f2fc5fe4151ab7af5f1bcaf35eafb712f62cfc5
font_02_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 15552 bytes
SHA-256: 3f2a9dd94d3a6c3d82ad4ac6da28d2b8d401c41ae1b2bfd2302b42957cc4a2b4