Malicious PDF — malware analysis report

Static analysis result for SHA-256 d281fd3537465e81…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 22:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 822ebea693cd9ce038b906a49a99b052 SHA-1: 47692cd349d0546b0a0bd4e451305a1c7c360f70 SHA-256: d281fd3537465e817f2c9c407a2540ea88c29c596fd2f67ea821a4156cf5601d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_MFA_LURE' strongly indicates the document's intent is to harvest credentials or session tokens by mimicking a security verification process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://presstone.hu/userfiles/file/72429554655.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/25ff1ae749a33505cc6c02b7583686c5/18889646076.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/89579225159.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076331eb6038---32872088441.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgiqsa9uv9n9tbvkpqcjm1ao82/jopufunime.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4sr5lalb1ojvrj1bi0mdf0bdal/55983646628.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/23039205131.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/zomusojimozonu.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/63277796225.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/54278694134.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/178hn3m2ju6hkjr21r8kr56naf/fasokasopaseroper.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084293fb9b3a---97414558546.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/mefikajosigulukipine.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/31037368381.pdfIn PDF document text
    • https://etadelloro.it/images/file/86922578352.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210613_092822_8202.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zadinijuxawojabiredi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/lurogadowomimixum.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/bosipetavimepitepotoroj.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/34042181074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=live+video+call+karne+wala+softwarePDF 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 17280 bytes
SHA-256: 784cf2955fad6c0fa548797d7ef26e1ad8b49f6b79bda8112b4c143b669eaed8
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 10672 bytes
SHA-256: 01e79d4351c0cc68b57ebbcca6501e140196798c0525db4899913180357f5295

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