Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cdfcda202ca130…

MALICIOUS

PDF

88.7 KB Created: 2021-08-22 05:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66ed5367e2d6892b49ba40aa14773943 SHA-1: 45936775682f278431a260aac0b8d255a8cc6e2f SHA-256: f2cdfcda202ca13023bb3b67149bcbe92f67c5b0a1ec4e4da1a6213826d52a2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kurtoglumob.com/upload/file/kagosijowukosobidivux.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f25a0cf87e41eb37623fcec1afc4c546/66047758239.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c43550a79f9a11b710ab238a95b479f7/guraruz.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/38403752955.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f212fafb3ace1f995ad6ab6b494fa549/30188129656.pdfIn PDF document text
    • https://foulardfotografando.it/file/fowumafalutazumo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/texanipifajunifowuv.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607327ed97656---botepad.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/7466868794.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/sunit.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/tizoxumevofudarefi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10eacd423---fazolusa.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/58103412912.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210807000722.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/92470167027.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/kuzurarimazuso.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/6eb97c082b00179d38f91c6b893cc1e0/pelukogorufepimafefoza.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wafavube.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fcb23ceb628a5b28258b4c7b8ce8938b/kaweja.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/jorirorit.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c952b36a8---govelovelelup.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/31641084650.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/62800923673.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/ronijujidexafarowar.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4709b76fb1---tusovavexugixesagiledexa.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fipamoriziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+hacer+un+curriculum+en+word+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 16836 bytes
SHA-256: 4e3924e667fab63aa18ee6e294f2b9c87850dfeb96ad595d08eb861a405190c7
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 11032 bytes
SHA-256: 3baf5f4d110f1dc45fc7fc440217987910be2e9c72ccab5aea53586bae899759
font_03_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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