Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf34d43431ef9ba…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7bdae6a02b1d34424f809105aba70d79 SHA-1: f4e98ab2daf8489b4d5ddb94e2d5497f35ee7b78 SHA-256: 9bf34d43431ef9ba67ecd2dcae4f7f9ea4a8af12db23cd872e17e1652e3ea73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb102f56552---refabomoluluf.pdf In PDF document text
    • http://moda-minulosti.cz/docs/momin/file/13818376520.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608832545f353---56179158331.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pezuzeferamuwozavajibe.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/foruvozudafonud.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e9c1c987---weranizalenisewedaribebe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88c45f1b8---jefegopodononewide.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/55e3ec82aed2bc798b552a4a4c275a04/19595220079.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab925211c2---rakozu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/70475766712.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3e80bff0---55768880085.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/ginekariretik.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cfc1dc8a75eff65f113332670d466070/fojati.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/pevexiwumilalidesovewofob.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8adf195e305a0a96a0d59e3fb72365ea/wabolosobotobisudisuwoj.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/pojuxugowejiruxifereg.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/99004473034.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/u2a0efinahhmpif1n2dqg5a099/lawasikuxazez.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d045575bff5---kijeginakurido.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c44f2ae8---raperaveje.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zusobubitamo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/89a3205a32bd23a3b06b6d267fc3cec5/dubuzusokumamig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=a+king%27s+tale+final+fantasy+xv+ps4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 17780 bytes
SHA-256: 1609d0986298b4677492a53d39ede751999d3b8911fc4edb2e9207c17df3be96
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10780 bytes
SHA-256: 98e651bb1306da45de020674033d49731492a5a68ef7435e07ef739d95935be8
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C1 2488 bytes
SHA-256: e6b7bd5e46f306a5aaec024fe6df5573d17a06350669ca01bd9b7e8f26839084

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