Malicious PDF — malware analysis report

Static analysis result for SHA-256 a334b1da07576662…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 21:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51428215e86ace3f03ff3778ab3f5441 SHA-1: e3400722c57cf95eca4c5578dc5d25ecd5660b2f SHA-256: a334b1da07576662d2bc09e9697246af9d23cd6dec88a357e5f80363fd2d8364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://animalscipublisher.com/files/upfiles/file/zoxegisagu.pdf
    • http://innotec-industrie.be/userfiles/file/wobivadesozuwijuxagujadof.pdf
    • http://dietmoiquangle.com/webroot/img/files/24355138347.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b079c98377d---fisone.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/duzakefudes.pdf
    • http://murphysbeads.com/clients/54316/File/6399569321.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcaa2de05f---46937016762.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e9afd043e---binatoteziwere.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a32d043e4---kutelejugazanawari.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5976d2c3d---lezasi.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75e8f5c456---mutawope.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/oafcs1qrpnu7b1p9vsvk4bsjaq/63102403019.pdf
    • https://airshow-bg.com/file/biwuvekawi.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/199le30ooo5pjt37bj90pia920/35154438302.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d6ea16fc368a62b46763bb2688e3e93/44234463817.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55ce4f5bd8af9f8d1263b508ab17f3d0/lajanifu.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710dac13a2d---sovavuxu.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ledavapawesuj.pdf
    • http://geose.ru/userfiles/file/fafododasukoj.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/gagawagofopemupegewuzawe.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a441cc5---33958389621.pdf
    • http://almar-bus.pl/userfiles/file/situsebefosemezukononu.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609090f804208---97345804152.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d41b2f30---bezifufemodagekipel.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c69c112ee4dcfdde7f10d0bb30c0c86f/85513513683.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=female+contraceptive+methods
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16792 bytes
font_01_sfnt_off0000dca5.bin
02bbf744b5b462851d593679c5992a39e0d0ed2a10793c26e50dd08a1d4ed22a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16144 bytes
font_02_sfnt_off0001062f.bin
7cfc5e83bf25a6dd868331c09b160ed6ba3574fa22fdebd006d903dc20955f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 10824 bytes