Malicious PDF — malware analysis report

Static analysis result for SHA-256 e611ccfd0d84c9da…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 05:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4de61b42e649b3f98d3566dc763218a9 SHA-1: bf2f9f9fed19e56096fd6163fa75bb998fe2b95d SHA-256: e611ccfd0d84c9dad1646124236cc2d1d58a140b4660e1c524c900101a83262c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://synerhu.ru/uplcv?utm_term=the+dermis+is+composed+of PDF link annotation
    • http://wallsfamilyreunion.com/clients/876683/File/56196904229.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/lovipekin.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/roxarusutavafuvuvo.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/3188170499.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/genogaroni.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/sopulogimasapamosukop.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/bemamefisefexubadasaf.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kewazifuwenaxato.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/59506171775.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f4bc8c40e099e9217b2190fd00c44c2c/wekipatazajaketuj.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2806c4926---xosewedojerabeb.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0be3ab85---vonizaxekipekaregabukumek.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e360dc8fefd---99187170440.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/judedatabe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092002a23df0---nototurenudozaxupodaxi.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/zekijifivu.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/83684411310.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/jugasarerekemidajabetonaw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4deead21ac---63333885710.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160712ab983a22---34539366271.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/80182439906.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cde7153ab---devetijolalejaj.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/31393668376.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/rukapesutesopemizotosa.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lk98eab1q5hma377h4patjqcm5/mikoguvonivaxotaraz.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/sopifudaxitazo.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_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 17048 bytes
SHA-256: 9d3324cd235cb9876af80df2c9e7f1b561f6ea433a0245775c9d75202563f66b
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 10440 bytes
SHA-256: 3ac122be7e25dbced9f8c93b7869f2700fcff2e6c08e30de828bcfe2d5acfed2
font_02_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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