Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33a551b9a6724d5…

MALICIOUS

PDF

74.9 KB Created: 2021-07-02 22:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f3a0b7e4f74b8eedef877387601c75f SHA-1: e13fe0d3de8360d8173df8175f9cdaa7d8dc69bd SHA-256: f33a551b9a6724d59d47e5e1e0e0fcc27bbf1fe5810c7e22a0f75feb819a9f2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised hosting points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=parts+of+speech+coloring+sheet PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3b3d3eca---boxerulamugukigimemupaj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ea7117dc60---laduzatediwusepogexi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/55f31a5cfa3340df2017018c048dcb89/68609977007.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f4815196---86966031916.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/m439tbnc2r90ciboi2nsmqsn2r/dulatatitesama.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d0b0212d---16173865292.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6845cc6fe---jenakusubiguf.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062900230531.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/paxudivimawegepoxewidu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/mujatekapoxuborinigipu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10894e2a---wesobajo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160703146e4f2b---27716155579.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3e71d4fa---41070925036.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c5d8677f8cfa61ba7403bc514f2b9bd5/wazuvopomipanik.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/krbdakngtsebqilepit3afjuon/giviloxuboririwajija.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/memirod.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/lisedet.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/80569119304.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/durenon.pdfIn PDF document text
    • http://intergeored.com/upload/File/luboduzufuwudag.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/21072238595.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/jolazuxowulexemedemedip.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3461700841.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/28715734427.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ffa8e9986---firus.pdfIn PDF document text
    • 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_off0000c3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CC 16192 bytes
SHA-256: 5d7445099049b68f725dd8946c65a97bba741db923ae10eb34cdf1c698193098
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10760 bytes
SHA-256: f1b86250a2043e0ae91dd26f293f3ff07df460ccc0e80afd1d2af5cf2f69dfd3
font_02_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1