Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee403bce235dff89…

MALICIOUS

PDF

263.0 KB Created: 2021-06-28 23:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b28dc993a9c1a596df5adb77a967654 SHA-1: ed5e1c055739228852bb2219d1f6daf33598f6fd SHA-256: ee403bce235dff89f707473add36107d828cb22aa9332017aa1c65f0ea8ac0d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including links to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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 https://inwebjor.ru/uplcv?utm_term=sta+21+medical+corps PDF link annotation
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e282d399b2c0aa5d13ca1e4376659a82/mimox.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f4638fed640ec70289e153335196c44e/23713390274.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/45943458254.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r1nooiktu9dnjfifledggig641/fasonijipam.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdaae50534---34033833430.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/81976622454.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/17aej7atf2oaqua8nfeaqicjum/50188429793.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8011c29ae8---33778781983.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33838155704.pdfIn PDF document text
    • http://planbmedia.hu/files/ketonuboxedikakafewelu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c565c0971ff---latexuvagaganeripazew.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7d2cf8d43d8ef646c6ded9e4c65e6cd6/lenupakuxazutoxananepowap.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092830cc29c0---gulaw.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/00a22ab26c1bc777c24854bd727e5b44/giwofanojokabuk.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d82977d5f23---77897433255.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b1a35b7a376bb1de11ae63ec2e84e70e/vajekasujitebukub.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1acb43c1---lamenujasomadawagosi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842bc5ff9f---64441776478.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b09dbb1275b---kepoj.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/71002013910.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/21e0df532f3b314c07f54116364b911c/barososamigit.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/47479543720.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/wuzikuzefiliwe.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_off00038e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38E3B 30444 bytes
SHA-256: 1422ec0609a4c29d601de061f8cdb8ae4f147a6a22a58f1d424284932f2af35a
font_01_sfnt_off0003dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DD6B 10816 bytes
SHA-256: 90af43d828cc9d73262a9de83a34c491b2f3072a9c7396f73e0aaf1db0a0436b
font_02_sfnt_off0003f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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