Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3536d8d865c0d69…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 06:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17c4169771097f86a30be2739a3a9c40 SHA-1: b957a835fb2985a0143a116d43e576e03c3e864f SHA-256: e3536d8d865c0d69b81e49848a7897c415a84b24002775bcd92075fd323bc0b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=projectile+motion+simulation+worksheet+answer+key PDF link annotation
    • http://aqbnb.com/uploadfile/file/34061686380.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9tkoellrhaegkr3shu81sb4b21/tijolukofekina.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/upo91b2n9f38sed4ir487bdj4k/41172411526.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210819030416.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/42090868597.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611186ba6c017---32441708367.pdfIn PDF document text
    • https://businesslife.com/content/file/54014750850.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b348db309a6---87616421296.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/sixajejijogujag.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba5338755---32508889988.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fijofa.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/68859787912.pdfIn PDF document text
    • http://myredm.ru/uploads/file/jadipiraxuvokotu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/fazafefetaluvamobamuxaror.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/bonafonubijotajiv.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/bunana.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf6a7b6ae---ravawafugebinup.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/tepulukitupana.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84dc78fbdc---rasolotazarunepar.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4590531e6472bb6cb0cb5cfc91f7f600/zajomaduxunatabivoges.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xivudafodenanesofozajada.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded20a81dc---jikesinozokora.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d4cf7aa538bdfaa022b94c43eaf33842/36358784623.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/lepubafisunudak.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/nedovolefokuva.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 11020 bytes
SHA-256: de3d41ae160b6c38c4e96a38c52c75d82b38e88f2bab73fabe1dfcabb6a7b972
font_02_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 17152 bytes
SHA-256: f71179955bf93c92da4897f34be98c7f8467863d8a3f103078db7d0f8d752210

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