Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df4b1b747e7c08…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 00:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5d869e7eeb49025200b603a44aaa1e0 SHA-1: 852903db387de81f8f846bf0f8f456ad40d42408 SHA-256: c7df4b1b747e7c0863d6c9983023047bae423cc6489af86b6467e979520204bb
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious payloads. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites or downloaders. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/seu3ogu4qaoj6t8d181hluvuiv/ziwovifuzamukodokigamewur.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/pawupedagevomov.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbc681f5f---vivagu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd76dec2009---zexafutevekubi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9cf878a6---2150185160.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nafekofulaxutugusalul.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/24501927572.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/20379770946.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/790e197394ccabfa449ceff39c0d70b1/junubezoremini.pdfIn PDF document text
    • https://hojoairport.com/images/file/6676084629.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2d6d5df7aec7d54ed9bb930f5799904/pisuvabapinosefi.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/10958042696.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/kapuloxefaluzix.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/ponikikonajifesot.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g1kkpo57q79924ua98h6t2cpm1/88354306769.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fd32baf4085---wuzalawusijovukegi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076445ee4a13---52572173686.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/88818277291.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16117fa281f6a9---25004846254.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/19293299413.pdfIn PDF document text
    • http://carszana.com/image/upload/File/bexenolaxax.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/juzifinuvifowafaginuwabig.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/71282545813.pdfIn PDF document text
    • https://eslms.com/userfiles/file/17313589887.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/vijexekawon.pdfIn PDF document text
    • https://ka-base.no/images_students/files/ganebezile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=australian+passport+renewal+pdfPDF 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 18384 bytes
SHA-256: c47f2b11dfbcd9700bbc28a773d2e0319a1f078370dd8ab21f0bc3b532f12a77
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 10656 bytes
SHA-256: b0e7ee60ee3d1b1afb96e64773574c3dbf67c7f59ca35cf03e3beb1eda03da5b
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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