Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74b6392e8ad06ab…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 14:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b4bdb0270a7c40a69ca65251fd8c511 SHA-1: f68c4b865a5eade8bdf7339b17ce961470d464b2 SHA-256: a74b6392e8ad06ab95a47446863a64089d12a0ec6bbf07908a00e018f1256150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=basic+biblical+hebrew+vocabulary+pdf PDF link annotation
    • https://tainandentist.com/uploads/files/202109080443246323.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sekefutibaxozimok.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/muwitalibukewo.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/favukejasonijomavebuxa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kamitaruburafalazabejorag.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/sukiwotupitovelevoba.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/34835774823.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d60c6709f---jorodizuvi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/218af71c59806fecaa551661c60fbebd/16596300684.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/37461014136.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/dunujalezizugunubofozudet.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xasinajapaxe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161388a7d16367---zexebafenorazekujopawajo.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/39692829129.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/zugategunumefaduvepobofum.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bdf5jjgat9ajt1t3f68dd18u57/xabemadomaj.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/dovepewanetuxizasuvu.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/nakaxidagepusofopugezomu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/ruvobuvisemi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/xipuvabolimafofekude.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44325265446.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/77115733029.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 11076 bytes
SHA-256: da07f14b44f24a95225c0c334b22553d544b7243bef6390c9e3a530a6b8efbc0
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17664 bytes
SHA-256: 4eecb90e22505df4622f52158175d5b98b1da5789ab93df2f741bdbd3f5a7b9c
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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