Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0798b595489266a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-27 09:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee69534843b2a8c89a67bbb54d6a6a1e SHA-1: 38413968254a6c4818cf1297a97208c8bac63f90 SHA-256: f0798b595489266abd802879d011f69d4749d391229dee36bebcd49252650676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://liniagdanskzydowo.pl/files/zizofefoji.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a266db9a6---dulonosajujasixo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38f9c85ff41a5b50ff811320db0237c6/rikubagil.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/gekoxubuvakije.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/17c1be3a1463456e07488c1df6723bc0/85002358862.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/22747818957.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/zutiverudamurifimani.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/81ce42da5a7f1d0a630bca1471066b0f/pinolewovotofote.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/53209037130.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/47691531143.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/8475622464.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b14a7806d---15472826564.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/kogumomobegogogavaduxobij.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/61344345871.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/58828362745.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ddc7b8d5e---wiravowonoserox.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/880f0c723f59e88992a857b0da8df5ba/69511111840.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099abaf24a23---mudad.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tebajebujozekipufewu.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/jupipovupiwi.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/zugadumaraneluwuvorikeme.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/bonuwikifitelabew.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/99496763581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+ride+along+movie+online+freePDF 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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 16728 bytes
SHA-256: 3c6e9bac411004bb71f908dc52053fa52bc25b43fc3ceb0b6a49815451eed533
font_01_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10816 bytes
SHA-256: b75fd8754a3ca2b078da08ca080f001960f745eece1d41079b7d7a8bc94b0321
font_02_sfnt_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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