Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a72d4b60a7be57…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 18:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13338e8ba3899cdeb60e0bb2b33b3e0e SHA-1: ac5efca8ef71d9329e715b59d14b6d6e83a90aaf SHA-256: e4a72d4b60a7be5723b953acefd36ec60692f07b3ee2c22cf85df45f9234831f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links, increasing the chances of a user clicking on a malicious one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nakatka.com/files/file/mexofudesotuluwetogoge.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/relizasadugasogag.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/88728128263.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/nifufovikugujewerojexewap.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c7fe37324d4457db3fdd0dd56858b2ba/muxizilu.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb15b7f139---senazaluvuv.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912726c5036---tupawowemalabamubuvuki.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/62249000364.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe9ef706d2---89658782131.pdf
    • http://flgr.ru/files/files/sanijoxomo.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b50072b245a2687bc1d83052d80a6aea/sifalufin.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a034aa59c835fea079c8b2c9caae4aae/buwumuzegafutube.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ee6e376f---73705550592.pdf
    • https://seeandhearbetter.ie/img/shop//contents/tavesopupuluwapategi.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/327626c1779e9c5221ad43f422b17a87/56017034058.pdf
    • https://ijpdua.com/contents//files/27705829526.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7aac6bb1---zefevibiwiwinu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ab2c6fe7---jitom.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c654vdh9a4ld80li41s29o4eb3/badovik.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5dcf1afb1919e1740caa648400d89866/99749982356.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c73506681---sanowutuvatolaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+download+pitch+deck+template+ppt
    • 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_off0000dd93.bin
b7d605c4ba18e846cd49036229c5a18512dcbebcc9ca26f1be6445245eb5335e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16476 bytes
font_01_sfnt_off0001085b.bin
b3540108af8a3db75ba5c2fa29f568938cf3d859966c6365e5bbd1c68c966788
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 10768 bytes
font_02_sfnt_off000120ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes