Malicious PDF — malware analysis report

Static analysis result for SHA-256 9741a72366aabea3…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 18:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f3139f87da3946f42fffe87fbf014ad SHA-1: eb1b01542f474866ce84d2d6feacf203f95b5dde SHA-256: 9741a72366aabea3e2fb89d98fef5e2b6942a9a6f34167f4fe4db8791d393812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://huntic.ru/uplcv?utm_term=stan+com+a+activate PDF link annotation
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/02ec5b1e234f1b62585a308707c96fd3/10122534505.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/35109816996.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/67579517725.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/67196815257.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16147310b1f804---30804407793.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/54298842381.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34253334292.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/6155604763.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/zisekolufinevorexed.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kakonisupopo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05eaffce4c50e39d3fd291fd3ea47e72/likunaf.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/wedifukimikofetugifiso.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/75670661332.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tegerixami.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/nufuvusabizomib.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/63376087394.pdfIn PDF document text
    • http://epicridesnepal.com/files/rofeserekijosas.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/14446277752.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/396298edd25b0ba28d152eee11382ac4/19946750684.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/61228032629.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431febc08d8---23531318316.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/lijafuparosivujeka.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/11252495350.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/tebel.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 18020 bytes
SHA-256: aee08419116ad6a9d410aa2f2c5c50c540cda8a0354f301643becfb74b776912
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10220 bytes
SHA-256: 7b9f96ae01e75efefee66b292da34ad4ddf08083cfd4d006455cc7ab40988ec7

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