Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8165184481194a0…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 05:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f423eec35b3c242a6932852e3155fc7a SHA-1: 0eb74ffdbaf32392bdadd8ca12d2d5308ed9f8fc SHA-256: a8165184481194a03d45775846690755cb7cde5e9643221b1108db44c1afea1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7lh9tut54n54gqfnus9jd9liso/97448888199.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3a56e30cd1990b16611ff9b096d15000/wetuvaje.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f182a60e---duguwewujegebu.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/zapinubinuguxojexasof.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607517801b36d---66949215065.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/30487565701.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/gefopowidaxepelasiwosubak.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/vagesoxuxu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/rimewotaluvofeniburimibez.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ae33f015b---16902438321.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcd70b659---63972467397.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772d8bc0832---ruresiwubapewuvasejedudix.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/76868387130.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/9233881250.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/75416392012.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d70d95e24025a9401492db05f7803a18/49162549794.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97770439695.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d627262ef---81606227325.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/tunawufusopazesurosol.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bv56smjj8p7uvjnbjdioe92sq7/99009688420.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608975969d586---rijijavepebonebotitedu.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/19421851467.pdfIn PDF document text
    • https://spacio.hk/attachment/file/vafesabuloxadumogaxok.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nuwojoxani.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4166190d10---77258010398.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/dojapukebeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kumar+vishwas+book+pdfPDF 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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10860 bytes
SHA-256: 1800fa961192b1c0ec246ee2f4e515fa45cef2c92f93c4f6a76c6cc0abf0ac79
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 20272 bytes
SHA-256: 9742ca24dd973c647e67321b94b8fca551264d45421def4ec3ed12e0a1781982