Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac68be76f0f5196…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 17:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af7bdaacfbef507cf57682585713b774 SHA-1: 1ff2c953329f115bdb84b706c808f492d24997e1 SHA-256: 1ac68be76f0f51961312a39e8e593515b75efcde6e329c5f7ac6b01c8c939c66
236 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document actively tries to convince the user to install a browser extension or update, a common social engineering tactic for credential theft or malware installation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=how+to+block+website+in+chrome+pc PDF link annotation
    • http://texinpack.com/uploadfile/file///2021090218253652.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/76538054037.pdfIn PDF document text
    • https://ksuskalology.com/images/file/bajozevijozoneji.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/bapikexidupula.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613131a4210d6---20591778709.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/12413813377.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zezowenivo.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/30302740926.pdfIn PDF document text
    • http://rococosofa.com/files/files/dajebosixelorutebi.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/mejetato.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a61db53a---tiruwerar.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/67566044916.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/nerovomi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/sol1cmfusggjtp8f6498tsdcv8/26828533671.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/41584319782.pdfIn PDF document text
    • http://3sdent.com/upload/files/dideluduzadiki.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/rexixediw.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75742970700.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/61041587296.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375136c7d68---sametazowezed.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/54861861200.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/jutitibozupox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161344d8f97e15---waduzatajor.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 17756 bytes
SHA-256: 3e243f7dd60922ab99f899e361680eb6148b4cd4cc22bb608efaa6487471448b
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10788 bytes
SHA-256: d6795805a10b35e22b2dfb19b4b1d4894c3d4f77d211f0917cac1a2250961ec6

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