Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c72c01285e5c29…

MALICIOUS

PDF

106.8 KB Created: 2021-08-23 12:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95b9a2770d959027ddb9dde37b2d0b65 SHA-1: 20cde34c0441a29d9b946945d2b468ac6b8bf7d7 SHA-256: d1c72c01285e5c29a229cb6d3c34ff8488f00b7a667e1b30e85172c0ba45f3c4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=how+to+get+italics PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf983e548---39626785817.pdfIn PDF document text
    • http://geose.ru/userfiles/file/gupipesux.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/82410321579.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/zojiruxesisuf.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b205edb2d92---poxugaxabirelewirorab.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/niximi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/52507666884.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2u24i1rcc8m0kinnb28utfjjab/76081316429.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/15444458046.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/lilimogupajamiguf.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c25e695b923fd794334f894e41eb6fdf/90428419962.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ecc54c45---lotase.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8a144dff---94523012944.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/pajowatudosujipot.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/derefaziriditufet.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/lejodatoz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc624d907---57029910207.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dd38ce85a55d6bdc68c68c620abf520d/51144103225.pdfIn PDF document text
    • http://skisun.it/userfiles/files/75151525914.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/naxawojeru.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/lugazomagurak.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8d8b4f367818daaa2fd84b11cb34fc47/51467612195.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/suwerojunejetuka.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zufokesolima.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_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E1 18624 bytes
SHA-256: 7c433598aafb6845a8cc86d12a17fd36875bb95b794de15a94438f72f5831e19
font_02_sfnt_off00018518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18518 10276 bytes
SHA-256: afa1dae423346167cd767a8b2a8b42156945ff30591213e022670044440ed4e2

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