Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52f377dc40e4ee8…

MALICIOUS

PDF

90.6 KB Created: 2021-09-21 10:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d7e70906905c7da0f95c79af94008037 SHA-1: 0aa7a61eba319591b4072f652abfc9c2b044ec20 SHA-256: c52f377dc40e4ee8b295d133df86c1ca40aa7f188c1e02023290aef4cfc6ba1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://nocenzura.space/web/img/podborky/files/zepazagufos.pdf In PDF document text
    • http://ambcavallon.eu/userfiles/files/55278489817.pdfIn PDF document text
    • https://e-midas.ro/files/file/49555345620.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/8607256209.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/muvoraxodufozejonigetanu.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/55039339791.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/kijulirigigesipijumubo.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/67382708795.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/73885746704.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/28304985561.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e66ef152f486870fcbe339f428933513/mikukexixelilo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/59652795824.pdfIn PDF document text
    • https://adikketiga.com/contents/files/ripenopa.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/43063308538.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/37623175267.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/jemupebudoturugavepofozom.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/wemonesalivaji.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/maregimitagokekujudura.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/013bbecc19e012297b7f19f520987f9d/46252506910.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613719c55bcfd---zoxiziroroliderexozek.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/nurekenituti.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/fumisunazitofejajemoxitu.pdfIn PDF document text
    • https://halkum.rs/files/10975931949.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/69990475019.pdfIn PDF document text
    • http://linker-apps.com/files/wumufupawafenase.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/mefakipedamuzare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+online+bollywood+movies+2019PDF 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_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 11396 bytes
SHA-256: 22195b616c97c34360a3f28b30d154b4e2430668014d8ce06a823370c7564a67
font_01_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 17596 bytes
SHA-256: f4a8d4b30298d67c274beb99cbd33c586138ffe6e2c3bcc4d50ee592cfff6fef

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