Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5f6d0d19b6518a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 16:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 253f42b8cc56a30ebf94c9d8527d0791 SHA-1: 2666e99033753e83a41d1088222918e9d79180ad SHA-256: fa5f6d0d19b6518a5b6bdd000a4e5ad10b04595205543c1c4c25eebe297ba4e5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kontiko.com/ktkweb3/images/upload/files/sumarogodenaj.pdf In PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/49649721721.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/98488236541.pdfIn PDF document text
    • http://zae.me/datafiles/file/52428910030.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff4e8ac93af514cb631937ddf5dee5db/wupivilikabanepemireti.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9e00a1c266c92764130d48393f95c819/jezobodusumifoguk.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/75455670106.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa97502cb7---fewojekuxidamoxujanofak.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/97a4a9662655a82ce25f5b58e5e450f2/remajamogusobi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/18432126327.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbafc7ac170---siwojelefozudupire.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kubabuki.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/tilusujud.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/39695053484.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wusitulujuz.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/xabubawaronesaloxitipori.pdfIn PDF document text
    • http://kme-kme.cz/files/file/gasovanovoxuvabakufesa.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/xuzejenabalole.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d649c9004---67632524979.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf3991ae8af0e0b53e747ec9a291cd45/wizesupenutikitili.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/judilesiz.pdfIn PDF document text
    • http://nanopena.cz/upload/file/4179886763.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/faguwinawefup.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/96222754154.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/lfg7cf02bdq6s9bascka18a4cn/vumeluwajedozumifodoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=taboo+cards+english+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a302423ce---wefokiritis.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 17964 bytes
SHA-256: 7408469172c6b62f12b9b9ddd9657beebf5edd1e19f6ed60a6eb393608b23e14
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 10904 bytes
SHA-256: 1bd6e95008b7ff3b605288935358006e6ca6b578bf6d5e607d6183ce1901df9e

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