Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b8e11bed808673…

MALICIOUS

PDF

91.2 KB Created: 2021-07-20 04:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a466cac85f398e2797f316f2e4f61312 SHA-1: deae2222201ffe637d54fd908c2e5882f1e678c6 SHA-256: d4b8e11bed80867347392d65665f826e71662e0e4286f3ceb2df56d7abed63aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malware or phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e5f263750---26030103728.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a38efc88394d8056649193d78f1865/jibesesanijowetakaxaxenop.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/43038092488.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6pk5u6qelafngef8kl69f8a5hi/vetidus.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/33ad301e74922abd6838c31d223b83d2/14618457078.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210624205549.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/89481283905.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/joviduko.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2mld7vg45tm72ecvbrmihf395e/63731609489.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888a954f808---50468522351.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/lagex.pdfIn PDF document text
    • http://balone.net/_upload/file///48951550677.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8619ac1e10575ca290b629b162f78db/26495683793.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/8093660453.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bf50175b1eb4124f9617fce03287d58d/besenovesolimozazeromebov.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8fd8381d---gufano.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac751a0f6cc---90715237569.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hpqr195is61nhj9m1oopc3sn97/bafebewotuvanij.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5b8dea3e---lodutafewodopovotuven.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9egbkeb6pgq8f8marfcu6a1tah/28242175602.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/vagetokafutemofenabik.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/loluzasivakinomutufuwuz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c2ee2a78a5beb6b7a76403817a93825b/23866276195.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/43852609815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=suddenly+last+summer+montgomery+cliftPDF 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_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11108 bytes
SHA-256: 7b1498c980e5cb0d7eb383902b1c121182d3941955dcc07dd3454f3595aa6789
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 17380 bytes
SHA-256: 0da99f5f37aae64a688199bd867c08625d4b44662429ec459179fa024caa3b3b

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