Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d874e3d352faf14…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 03:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea243f6e17f507868846a7d72aff3f24 SHA-1: d0a8c216c2254d75f4f85a23dbf80a89065dd760 SHA-256: 6d874e3d352faf149cc99d4e81f076f92fc7bfd5a07d880e7f6df25e81d369bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links strongly indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=medical+devices+engineering PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b036744f0a5ef05290ee8c8579cf24af/24564245645.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43942824438.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7ed4d4088eb530f825a820f56612dc23/selukefokiriwonezovad.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pmdkuimt0ek5mtk4bgp6i2je42/75536792882.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/28560740865.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9f545d12d---koledizugifuvolofagotix.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/98263243519.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/beminafuredojibesi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083483098aeb---71104308663.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/bunewamo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/zisakokonutiv.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9d656bc00d7505354b2cc6c04791d03/norox.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/jupab.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c032228876b---33340302922.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079abb029ef7---kigiloninu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607754d02ed3f---girotezevonuginuwej.pdfIn PDF document text
    • https://andrejc.si/files/file/wujomafifofutusuta.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/89349847112.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xamotep.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/xamafisosa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/57982066664.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 15628 bytes
SHA-256: ab9ca8b028a4c7191bf27a470b570c003b4f50984a864c23b577a413bb951bad
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 10388 bytes
SHA-256: b52e802a871049df4ae874f3e74598706fad6804fb0b11a5fd6bae2395478171
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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