Malicious PDF — malware analysis report

Static analysis result for SHA-256 f906e34437b11e11…

MALICIOUS

PDF

101.7 KB Created: 2021-09-02 16:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5713b963c49e21fc57b06d26e1495811 SHA-1: f68468d61a3783b5ad51cc71ea4e54154230dcb0 SHA-256: f906e34437b11e113b5ad372828fc9a78b3fc86f1e46c6804eef002acb6459d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely lead to phishing content or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://latexindia.com/userfiles/file/wobirumo.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/31417ef00657ad277e9e9ec337d53a69/tawaroku.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/92917499664.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bc537c27fc08946fae2c2bed57a2f51f/pigujawakag.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b0374bc---37801472.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c631968e487---leluzavowi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4nk0o5s69kqq2cofkg9veckbmp/gemevojuna.pdfIn PDF document text
    • http://balone.net/_upload/file///20489925165.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/53770897053.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/wubokoladijumutewije.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/posonenidawulevu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zesov.pdfIn PDF document text
    • http://web68s.com/upload/files/rowepemasapetoxafa.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df943d44452---20207018811.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/98666133577.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2dfd4b2599e6e6348d24ab9191e38c38/waxekomilonol.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8395b080cd---63221426932.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/58631647847.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/torera.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/83205885153.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/27015730392.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/litobesajebosenufo.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/11537797465.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/8421671358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dimensiones+del+comportamiento+organizacional+pdfPDF 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_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 11024 bytes
SHA-256: e002f193ffcfd25de36ab19d9a666525806654b817d08d85417f0841466bdbf2
font_01_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D8 21052 bytes
SHA-256: 3652d80e7fe6a5faecef46b9c4df1ec762941e476244aec877467c14b79e0f2c