Malicious PDF — malware analysis report

Static analysis result for SHA-256 333a6ebaecfdc76c…

MALICIOUS

PDF

79.8 KB Created: 2021-10-05 01:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8ef1a2da0b94b4dc9260599751deab79 SHA-1: 12c4dab66e0c47a0ed963348e0cf00001ad3fd65 SHA-256: 333a6ebaecfdc76c0a571a1344ba9d12ce25c98640e42547e6cd7001069232c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=amazfit+gts+watch+faces+download PDF link annotation
    • http://ferien-in-zahren.de/images/file/35309863740.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd0de95789---kavepemigegilo.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/pulopikedonesovixobeb.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/17089324445.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/24697441609.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/samibedepidabo.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/8752081447.pdfIn PDF document text
    • https://raghuvirtrading.com/userfiles/file/wovigoj.pdfIn PDF document text
    • https://afayl.com/userfiles/file/35367376880.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82198467909.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbd39a62a---kidema.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/31411049225.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/69057890906.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/85445732692.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/32150908966.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/56404083358.pdfIn PDF document text
    • http://badgerhillfarm.uk/9944923955.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101456523845.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2c54b98d---menotuzajonirelewaru.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/97092944257.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/49010903435.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/93938580069.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/16807127519.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_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 19340 bytes
SHA-256: c031fc777af480c2e5aab4efec03a7a30a2e11be8b1e52fad4a64b2592f041dd
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 10948 bytes
SHA-256: d2f4e78f977b70f4b3d923529e0310417293a6a19505d5adf2abcbabec1a8e7d
font_02_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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