Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9446c2f29997509…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 10:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9becc67db85ac122580435cba34f5289 SHA-1: 0081717ffdae9dff75100bc8d72875e96825b8f0 SHA-256: f9446c2f299975093384448ed63d653d5d1ce593dbf6bd151a8818f6ff0ac5f3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mkngsp.ru/upload/files/jefejadi.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f533e7de308b0a22e6902824b4cde7c1/lobegaxesolop.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/2388011913.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9d3ebf0b---76740763262.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107140146395693.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4efb3029e9c709ed484591de4190acfb/kaneminanivupega.pdfIn PDF document text
    • https://umartravel.com/files/xatofijosujiforigiwov.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/21923532863.pdfIn PDF document text
    • https://marosme.ro/hirek/file/15469560630.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xedolowafulibupasafu.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/42942674706.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/49920711418.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/kuvabafuzomokej.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/terefiw.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/wazurum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/otp13d5v6c5dpknoh2o31cru35/89408393119.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fawabuliwel.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c37dd000c7813c681e62a855cdb62963/ruwivutowewiberijukowiniv.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70326497883.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jk6nduiaiaooqat9v3ubhi6dm4/kezarawedidoxopugaseb.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/83412203733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=independent+and+dependent+events+probability+worksheet+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_off0000bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF68 11044 bytes
SHA-256: 7b59816109f639ee697d2f72ef579d7e6768eec227eb5bcbf1283c32599865a3
font_01_sfnt_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 17652 bytes
SHA-256: f86aecfd1f790d0107659cce0add30f768b0aecd1d16538d96a5c071ba70ab99