Malicious PDF — malware analysis report

Static analysis result for SHA-256 55009a2f5692bbd1…

MALICIOUS

PDF

89.3 KB Created: 2021-07-18 14:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d95ead34e30cee8a74096573615eadd SHA-1: 6ce480253b07ca9fd1eafad1eae32e631e12c172 SHA-256: 55009a2f5692bbd19faac0ed6f526223bd24152f76ffde9b817710727b8e2a45
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://moda-minulosti.cz/docs/momin/file/mekimijil.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dc420e920181ae04ed81de22af2ef0bb/labokexapug.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d3229eb87e427fefc19c05a07f794e4a/96770969315.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fuwidadesatopidomoru.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072e314bf23f---89163485296.pdfIn PDF document text
    • http://limoride.net/gallery/file/zixazovav.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/028d112938591ebf9cdf5e83a9a60c10/73022237754.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3p6c1f2onsrdr05mk9gh4vhf58/94583571052.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/45ec731085ea22aeea66edbd13f039ef/53439442543.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/letija.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gorotagewulewaku.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0k87hqleoi6p6b6049ju3ge4bs/41548412054.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f71afb16ff10f786b19448dd18ccd2b2/13027178536.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sirumepitofizelaroxek.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/93746229797.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ab111c61---fepaxi.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/62987877187.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb9b8c334778e06c457e1d1a7d4f1bab/95801138094.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eadad591---39554155749.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/jaxomow.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210701205327120.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95a051da0---34215905836.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084c0d19cbca---44046236442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+shore+house+wildwoodPDF 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_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 10128 bytes
SHA-256: ae9a2a8dfc9440f8705061644f219aee6f2f4737050a3c21e57acc4f36df4392
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 18636 bytes
SHA-256: d55f3738a9d4fd7ffe7a9ffeeb8c4f9f9df2583b0dd9cfa83348193056465c23
font_02_sfnt_off00014020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1