Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da7b586b106f4b8…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 06:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9f61e22a8a133e19b917a80491f56ba SHA-1: ab15e1f50470fee653667e4cbae5afd903d0420a SHA-256: 2da7b586b106f4b8de346ee74c30e08e3fb5f24f64b2997bd0e906c8621a5f7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary goal appears to be directing users to other malicious PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kalmi.ru/upfiles/files/novexejidimatelomibezuvon.pdf In PDF document text
    • https://luathoanghuy.com/uploads/files/66621054511.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nemejemiwolaxe.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/jasoduxowejanigiru.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/19dab11eebc0b56cbd5b4916475a7a2f/19839850346.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3992631731.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6260502423.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/dopitufagobe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c853a9ad7---5388272789.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917fd15e594---fazefubadokanidadagufone.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/g72i840d1sp9h3ek3aflcno5vr/nozipawuzagam.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/povevubigiz.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/13928461843.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/zupibabox.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/walevibeneluxedos.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/27394088080.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/62836708313.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/840104a05f922808888cebb1bf30a0c0/60307681745.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tsknotm98vijhkn5de9e3qvjk6/diniminiv.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/merawud.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2cd7f2062650d5fc92a59ffcb4a3c55a/32944899484.pdfIn PDF document text
    • http://hcstonetw.com/uploads//files/202108111821543454.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110399b8550b---19927797605.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/geketuposuvoter.pdfIn PDF document text
    • https://noddy.nu/images/file/24489827948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=excel+for+dummies+2020+free+pdfPDF 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_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 17260 bytes
SHA-256: 3f4ebdf60be723453b20c5cde127e39afc194b17fbadcf298dc82102f5138295
font_01_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 10844 bytes
SHA-256: c38eb95e4c3e42ae2e4b71677a40efd51bbc956c17a646e9d93e5c4a7c39715e
font_02_sfnt_off00014677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1