Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ccd0fbca19e4b7…

MALICIOUS

PDF

93.4 KB Created: 2021-08-16 14:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2034dd5b123ad42727e5d8fdaa9b80dd SHA-1: 17018ad89d7ad9746990b136d5b2c22342ae1145 SHA-256: f8ccd0fbca19e4b7f3a2e19b4c558ce55738a2c7fe4900d0e3f82b413e9f398f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://candientushinko.com/images/file/guninededafidikawinaxi.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607585944ebd5---rekukomisogolutevurisi.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xuzikajubimifuwodokomulis.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xomijowizoboregifo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7186f9c59d4c1051a057ac185e8afb35/xesavak.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a12fc8236---ruraridereparevaxabep.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d834a961---gepanelumo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bb5a29e2---lanepuxegumekufifoferat.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/lopitij.pdfIn PDF document text
    • https://cristalensi.com/public/File/silamifodavo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f632ce6c8e9151815e4a5c0fec97a2f3/1576131074.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kowov.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/78fe6385d2e47496fc34657d093640a0/lugidomezu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5afc84049---gililitemabokavokuxuzat.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/19444610146.pdfIn PDF document text
    • http://contextuae.com/resimler/files/93822328753.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983766b765e---47112571503.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t68el91lglbk8ikjoksquo2eh0/nifolepipiwidikakul.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/lenebuxijujofudeje.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/12391661474.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd3sotv2au93ltnh9v766uk7hp/92138144690.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vuketaluwifod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/57622466298bc2107d3e0976a1e8cc7b/zinipuxokexizarurifanizez.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5bbd8451c---59349237497.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wuwesowozukujorarasoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+princeton+review+harder+than+real+satPDF 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_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 10716 bytes
SHA-256: 555d94d1f265db58b8dafc249526a134d451b99a6ff2b79c70f85f22c32d8a3f
font_02_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 18068 bytes
SHA-256: a843b880c7ce252c1206c29607afbfef148693cca6ee5fd4b461e9447b87fb3c

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