Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec470b961aeea0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 11:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bea8ede9ea42e955d64fef9cf3369f24 SHA-1: 6510f3534dee2dc382326f0c8315f3da2aaa1a33 SHA-256: a3ec470b961aeea0fd70f87486a68484b7e2163e7b69b240e33e2d370f8e2387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or social engineering attempt to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdf In PDF document text
    • https://santaclara.com/wysiwygfiles/file/ganaxidufonuj.pdfIn PDF document text
    • https://huanghecables.com/d/files/watevisolaranu.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fidupurorupu.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/370115322.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/livibavasewodatebewew.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/tuvutofuf.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/66259490804.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/lobalaweporojubowubobikex.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3442ad98107e58a85d0b616c4833dd6a/79833325726.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/526861c1ad8f680e976b873059518011/31966481332.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c4d644adab1e9017ad729386212ab36d/juzolurezurilimuvusipoje.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/55032357170.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/41979619556.pdfIn PDF document text
    • https://davnosti.ru/upload/97469174198.pdfIn PDF document text
    • http://africareview.in/userfiles/file/34759481656.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92238783454.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e074e9f894---modopuj.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/35227144023.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/kuvasavalulorizijiwaxux.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613278a8b6f36---29958215289.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/oefosn3gajiipjop9l0poncq30/76273913677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+play+store+app+installPDF 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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10588 bytes
SHA-256: 7992dfb59f7636849627649dcd6df59c0689d1427df7fd836ea42d0709bebe67
font_02_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 17444 bytes
SHA-256: 81c5b12ca509a019ae91b48db80c78e4a783e5be0237175a25f6bfdc3008a356

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