Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47b2203c07007ca…

MALICIOUS

PDF

82.8 KB Created: 2021-08-25 15:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac61ba63e75a84daa6f7400c4dbc3f13 SHA-1: ef86131faafa231d5670e59d5b91bd23b1ca6c08 SHA-256: a47b2203c07007ca93f020787e2552f810e5dea5c03400e9eee2dd5899231ba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external URIs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://perfekttorun.pl/pliki/4053459952.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde0bc349f---6533577481.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/723092e244ed9c8b83f304d13e19aaa0/28518229688.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/28569972230.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/sugubezibulonev.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/72171361000.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc91b9ec198---sutesejodepuxekeretesezu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/875ff9cc8ba1d7653a01db24a2a33d7b/sipikolasidojo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ttrflgg94vcc3t2vjdnul50r08/galaj.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/bixibazotifuwidufigo.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/46959485013.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7e2f8892d92f26a786d51d75bcfb7ef/18239553393.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/21956945892.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/840b6a65f8807f84063ca9e05114dde2/penelasatexulak.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/67989051175.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/48287995218.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jupa9i4lvem26i44c9kfblres6/13822878581.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/bolupiruda.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/89504324902.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25130c5ba---rasavoki.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/25806088166.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d66ec0a---30065024115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=artificial+intelligence+filetype+pptPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/153363cdda006bc1664246b05d32ed81/78109664822.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10460 bytes
SHA-256: 8f49dc6dd3f4a3b4bc4d3db84ad53553df38c9463957606d22de90b76b1ecf3f
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 16332 bytes
SHA-256: e5839c0a0841683424143c0e3cceaefca34c4e100bcb69447cfae709b957a4ee
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1