Malicious PDF — malware analysis report

Static analysis result for SHA-256 da72b9f77e5408c3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 11:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64fcd52c6de8622b190947af2b1c37cd SHA-1: aeae22381037f562a5d30e5c905a6467707fcbc5 SHA-256: da72b9f77e5408c3e039609d7a691b3849ee283f3332341b4ca19ca15463649e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=the+rebel+camus+pdf PDF link annotation
    • http://immobilier-valence-agen.com/userfiles/file/bemekugiresozujakidimi.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/rasunazozikojosasotuk.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139595d8e3f0---53180865526.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2d1dbf40211dcd244bcad069f864946/nexasoz.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/7286451164.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/44742026331.pdfIn PDF document text
    • https://suruburi.net/mm/file/raraxexoxed.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/sowexiwesiratelajatu.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/leledafukikibuterametegis.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101644488239.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/93283556590.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/bakinefidesiforoduwu.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/sezapakonis.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/34757626357.pdfIn PDF document text
    • http://grandfiltr.com/files/file/sebafimiwu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f943e68d54---vizapojexupizovosefifivaf.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/vokiz.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/14478564301.pdfIn PDF document text
    • https://advik.net/userfiles/file/wusevezukuzeg.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/liwewesivuf.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/gajegivejiporukilorabu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/63268177064.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/63508829979.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/befufe.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/dabudososafotomafen.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436906b9d6d---budixitarosetujefowaruj.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/xutinegofavazam.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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 10676 bytes
SHA-256: 522d99920539c7003994d782092a93899db43eb347afefcee3b3d280088b4e60
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 18736 bytes
SHA-256: bdc56b21c72405adea745459742d447ead9c8341b7c5d90e51712cf32cb2e4b7

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