Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1847cf797dcf1b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 06:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d7a33935698ac56e92ac5dbb3fcb8d1 SHA-1: d8b138cd81f48ecb0eb75c68b17c744881986ad0 SHA-256: fa1847cf797dcf1bbde975a65f8e081e54aaad03c5cca01ae05078a7d97ab885
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and link farm structure suggest the primary goal is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=exercices+corrig%C3%A9s+maths+tronc+commun+bac+international%28biof%29+maroc+pdf PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/nozage.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df32cf1e628---jaloporutope.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/zatob.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c20af3dd2---kelidasitisakurigare.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/fesapufuwi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/80754547289.pdfIn PDF document text
    • http://ombs.ru/uploads/files/97386803236.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4818250946.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/mitukezuxa.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/76977809856.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/rurivexofirusane.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/zefabinorufokazima.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607263696df87---83279297552.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/suzavorawesitotosuwa.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/8fef32a22482231af12a92a71bdd4f84/pijedufejejonabolaxapukuz.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/30556440881.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/65738179101.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/bowaluwiwudedevevu.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/situputejinepib.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608522167599a---zabom.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3fa9013b7---52608845034.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc6b487b---29099122417.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///57813074962.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/jalos.pdfIn PDF document text
    • https://lasanisports.com/files/90713532333.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/84087832097.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/63f4abcf49a15ea0e8e1c55157142d58/36600981742.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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 11700 bytes
SHA-256: d77ee078803b60cd8f6963af189c9a4d3d48433c82a6d6db9de1ac8c679c2f90
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 21116 bytes
SHA-256: f86f0b78798ec9284b36db2d10a69a2f504bcdb6d463b9962f45075e84da3726
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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