Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea545dc3548017dd…

MALICIOUS

PDF

107.3 KB Created: 2021-08-18 17:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2b4756cf8a7c35e5e800d21d7c9c8b2 SHA-1: 88a98dd144fe91ab74969ecc272212e95248cb0b SHA-256: ea545dc3548017dd212182b6d45a0d01aca8f5263e002ec460fdd7cd25bececf
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of external URIs and link farm heuristics indicates a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777eb6ad3d2---zapagavebuvegi.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c009864c749---21867663580.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/736c3a3b9489844e7ac884976d885d91/40620211403.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112336cb---26855055444.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d495627a8b---20975736656.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/adf6c895f7a9c5da5d47a50279cefb49/susotebabenilile.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/wewot.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9tv59uq2qlffo4irh8gfc94tp1/vapadoniputujomut.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61e3dab5b---puzisanifojemanegowuvin.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/53865109013.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/gugobam.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/28292858516.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5to761v8msioppd34l05judocq/70236907639.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/vuworekugelupiwokafuge.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/wuwik.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rafijelovujoloju.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/sujijamidotarobutudepov.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cdf13ce86---20454660754.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c689c45c6812e7432b6812a455331489.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c795b6206c4249e843e44955f1e24423/8103075239.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/56360512424.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fe3c1323a---romuluxobixik.pdfIn PDF document text
    • https://coevent.ru/upload/files/pugegusirizewukodipufi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de676e9983---99373581224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=transformers+prime+arcee+kills+jack+fanfictionPDF 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_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 16516 bytes
SHA-256: 3cce14260736f8a09fcc5461e4a5b1c65d6f8fdf2ad74bf9b112d5627b58b7ae
font_01_sfnt_off00016e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E55 10828 bytes
SHA-256: ec322d78ba91e1904b1b4e04d7fe97330e20e47aea84cb26a043626708b760c1
font_02_sfnt_off00018747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1