Malicious PDF — malware analysis report

Static analysis result for SHA-256 33878cca5e627165…

MALICIOUS

PDF

295.0 KB Created: 2021-08-13 11:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 604757613abc43e7419b35ccb142cb45 SHA-1: dedad1bd43d98175fed331ac8b15789750855bdd SHA-256: 33878cca5e62716513c8a69b080d106b2354ae91da17ab44f093c954ee4202ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8229

Heuristics 5

  • 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.
  • 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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/72d73f325838416abe948d082ad0e0fa/57593881386.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd91c727d---19374688230.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/tividewulagojozi.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zimewupubarivomepuwuweg.pdfIn PDF document text
    • https://banghenails.com/upload/file/lunufobotasoju.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4600a53f1057fc609d799deff70d1a9/83097878852.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/769d9e1bf9f654df427dc58a57594cf8/refirafojagabarojex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805a5615bf2---6902700811.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/48507690955.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/3606250224.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c552ea67827---rugozezirebowodem.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sijufuruzunadaworixeruni.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/45879879781.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608188aa59822---nekabemiwifedumad.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161155fdd5c715---jefamuzisamanujotujudo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e0b768d86266d4fd4911fb379a27c2d5/supejorirafezeraka.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/28693004988.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/wozifusoxeputugojiradexi.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/ganagokuwifamogakojimu.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/86300662887.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607784e2c72c5---kezuzizasumudop.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/83452596510.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/61482633656.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/58529886521.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i287nrlaue8r4kn27guv04bejo/21446811658.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca29302753---bunugagatepibug.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c83038663---kitademujanujedavuzip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+the+main+doctrines+and+practices+of+christianityPDF 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_off00040a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00042235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42235 3296 bytes
SHA-256: f6034ce4ac01a72dde93963472445ce74e3c455708595cd6c87dc5745905eca8
font_02_sfnt_off00042f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42F59 29128 bytes
SHA-256: 021d2a920ca2aa59bf53fc381cd2d3578f2e2542135fcb79263fafef6e753161
font_03_sfnt_off00047235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47235 10948 bytes
SHA-256: df5d35111ac96c320ed90d926f2bbfad38d86d6c642f42d1b5fa7c43384b29e9