Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad0c4fa15f3ebd…

MALICIOUS

PDF

79.5 KB Created: 2021-07-30 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1c56beed5757bd0ac6c521d2c0978e6a SHA-1: a07784ed5b4338f443194c61eab67f2832adac46 SHA-256: a6ad0c4fa15f3ebdcb4896da23b1b1f3ff64fb8a65fbfbb9693e29efb0cfd561
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure suggests it's designed to lure users into clicking links that likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aliceinformaticasrl.com/user/pages/11097282884.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966293f36e4---xujifiboditojojagax.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b112f790c50---93912212055.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eae438866---51085659443.pdfIn PDF document text
    • http://4bx.pl/public/file/rerutifopobigotalon.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tigisiwusavuxi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/73790427969.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/90294362319.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076866d037c4---21123966913.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/eeqgghv85a43rln9cvpr0qar6p/93617289264.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i7vek578kmp8cgj2a00agaokvq/dujiminoxutetezujadu.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27047198337.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/55dfc14b2b139c365b6178369d9ac2aa/38876964156.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6c4cc461---sipoboxulejoxuborejaki.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/nejivirojepagogil.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4f093668---13972231483.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074834a2c7b8---80869037961.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jutidunetuxawa.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/84473600739.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7e6e67bc2f36ac38fe7f8e423954dfbe/somosulakigobur.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e4dcafd79362957825cbf5aa50040c5f/bexawelebozifiripetomu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ced31fc716d---1672512007.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kegemawumazinofekixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+choki+choki+ar+boboiboy+mod+apkPDF 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 17200 bytes
SHA-256: faf8e916cfc48c120574cbf6ffbcb5c9d20c17038a4923c9a5f756ef5fbfab04
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10816 bytes
SHA-256: 3554691333d486716f3984c7edbceba65cfcd4af2ba9877fe56ce6823bd69f05
font_02_sfnt_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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