Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d4f4a71404b99e…

MALICIOUS

PDF

71.9 KB Created: 2021-07-25 17:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32c9ee7822092799e506b59433c324bf SHA-1: fbff1c9a32e5caffee83dad5e0122cbc1facc6bc SHA-256: 73d4f4a71404b99edbd0d755b9489c19929516a8195b688d2cbd134e8c19c5f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external PDF files, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of numerous external links and the overall structure suggest the document is designed to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://h1t-url12shio-turbo.com/contents//files/60037329303.pdf In PDF document text
    • http://brilspa.ro/userfiles/file///pejowuwofapupazer.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/74919542821.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/40741993612.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/patunaketemu.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/ziriso.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/dovaguzixofejupe.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9voqqj37mko0rmqh9ds94mg7m1/welofiriwikapebebaruno.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ruxapazivugagelejute.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/76824656464.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/10252f8632a1ddf780dceee59879e9fe/nonanimomosox.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/22464903556.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607340589a93f---xulixapoki.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c697fa3eaf---51775829222.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4f4df574---2180827203.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/8749387439.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81144d3e83---77110180468.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/58201588036.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/76480720738.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/69048089453.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/48917322928.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fab75096---22207689593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+mania+legends+hack+no+human+verificationPDF link annotation
    • 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_off0000b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 14992 bytes
SHA-256: 28f0ee9b8089fff26ebf155d119aa3bd8622171d18773f42d59ca58db1beb644
font_02_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 11180 bytes
SHA-256: 0e566a2c4e5ad8b8df288bd5e35bedf6f160fbe3865fccb230abf0949d060179

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