Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22224340281b955…

MALICIOUS

PDF

86.2 KB Created: 2021-07-29 20:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1a9bf94740fd19e38a40418c1bde822 SHA-1: e55ce32017b52548836cc498b017f1562730cdbd SHA-256: a22224340281b95590ffae6f9bbfc7bf9a9ba587a1b78ff7287d910e043d849b
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to prompt the user to install a fake browser update or extension. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern points to a malicious document designed to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/4b4067713de8e8a819e40b889386e46b/48595378813.pdf In PDF document text
    • http://vitalchurchesinstitute.com/files/file/naxuwutamiwafilijajemibe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79158a666e---zutunefadap.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ca3950718241a6a7bc5724f69c8a453b/takamonutexagebaso.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/50703721199.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/19846903899.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160be3bf5a1ddd---48157865996.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7b8c40c3---tumuwaruses.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/1810453112.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc61aa98f---89785201005.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2cb55da1f8391b04531860b1e945fe8a/duguxewof.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c639bbc5b8---kapuxitor.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/10812309324.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8764b343e65d76eb2702d3d8080db0f3/wenakupirozuvabegipi.pdfIn PDF document text
    • http://gabortech.comadmin/file/85156042742.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/42657948494.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tijewanifa.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cc3b48330ae8dd2196cfd93d356a8e4f/kijimezo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/giwuxudugeb.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/gazireduvujabawaguxaf.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e176l6qj1r4518uk0beo8sst8k/nogejelutadifol.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dotonewosuluwi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/teseliredamesozafodem.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/36162897378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+a+gmail+address+by+namePDF 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11028 bytes
SHA-256: 78511804a3cb32e177a5895302a96ee05a0fc0d61940c16bd933d208c7558b76
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 17852 bytes
SHA-256: a7b6082cf61faa1249de5ae57829a82fe27354ac8de5386126c7a49235e32805

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