Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a8f25ca5e32534…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 22:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f971ac835acd0a1a650550d2851f22f5 SHA-1: bc6653bfe00da10f08ac6b36a32703696e1f5236 SHA-256: 91a8f25ca5e325342c2f4654c1f13bf10692d87b12779040cc8b5a9a4ebf083a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting the malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=business+analyst+case+study+pdf PDF link annotation
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf598ba80---betesatumakeme.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/37331582040.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608943737c819---sipamerunofonatave.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/666tmso5ifr6t7ou7fv7m29ga2/juvarelarerafedidase.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xixuvevilazerojuwibiwux.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/sufinojuvugar.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/61126736462.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/t3m4aukrvjhdcihmo4r1td90a1/1768702558.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/doxokomalilaxuderevifigot.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e49f6e4bb---75488671701.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/24733160728.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210705_121743.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/551dccd508d880b8b37e949acae30ae0/31134972127.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c80f696bb---37420224702.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed09dcd82---22070406906.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/lekixa.pdfIn PDF document text
    • http://malifer.hu/upload/file/noxavinisemufepesiv.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mcuu8ue4hdrpb2pfsvedqmmc2u/21703130641.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/14793501410.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/63629278646.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d0027ba5---munosiviwigepig.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e8752cdd6a2b42279a1d65d33daaddc5/41272681415.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tguvv4cpsbgoo9msbmtmaagmoa/faxagexokuferuwerodi.pdfIn PDF document text
    • http://kco.su/userfiles/file/bobadoxepabizavarodovapo.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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 17084 bytes
SHA-256: 40683b84aaa9e313e6bbd7a43d27c2a84856a017516e17dea6f9decc9419c35c
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10660 bytes
SHA-256: 5fa52182da51a87faa578b716a996ed13068af3a0ce4acae2f5dfa2fae48a061

Open this report in the interactive analyzer, or submit your own file for analysis.