Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da1ac4436d3c2e2…

MALICIOUS

PDF

119.3 KB Created: 2021-08-02 23:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 25ef155ca5311b3cd4f915545ef592e5 SHA-1: a961e6dd0f4250dbd07b17e5f293e06025adb79a SHA-256: 5da1ac4436d3c2e280a1ee3779fb0fbda81faa1b658b1e75230d42d7607a0e9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3bfb1dd5---xelejevuvuro.pdf In PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/9325783545.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a3ed3951069c15673e86a94b9a507fb3/temiro.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/jovepiwegibe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7676d7120bfd2cf281bc904bca9e8f3c/47908954300.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6f1a576---dejojulisasebubemupopobop.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/bipelafizitu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/56885018044.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/25sq27mq0e8koebc6h1p1q1833/nagomusog.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813859be748---fawimunimisexegatijof.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/kokupewixuvexizopij.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/42638121515.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7507ec720---dababizugefaribodoxil.pdfIn PDF document text
    • http://soupworld.de/upload/file/xibadez.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d2e53660---53851368041.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p8m40ccgt80092e5omklrh3lk9/bekapemab.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c922de9bd---25894708012.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/43156381899.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3f47ee8c09bb7bdfbde27c0ca222d4f/jadif.pdfIn PDF document text
    • http://aa-nusd.jp/4833339472.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160868e069e83e---15258098536.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab8ccf0e4db94cd2b78adfbf1224c379/92746248448.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/terefukuravig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=learning+to+read+with+phonics+letters+and+wordsPDF 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_off00016f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F63 10836 bytes
SHA-256: fb7be4c7d8d1fef523bfb931602bf0653b047c15ddc0e6ccabed52c647b5683b
font_01_sfnt_off00018829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18829 17624 bytes
SHA-256: 6d07699c89c80f144fc9e44d4c0e02f4a14718141c81fefb1cc30ca9dd415ea2
font_02_sfnt_off0001b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.