Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2eaf5ff868c5958…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 10:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05448243767bcb2d61c5f80b41af0144 SHA-1: 7a8e0723d712eb0ac901b3c628eb4ae134b86899 SHA-256: b2eaf5ff868c5958b8835e1d07e67783c11fcf56ec78d374222cf4dbb23a8c58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised WordPress upload directories. This indicates the document is likely part of a phishing campaign or a lure to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://jamurgoreng.net/contents//files/65511523086.pdf In PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/64310536808.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/sivajivezuxovim.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e4eaf633---94423860465.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/28761361837.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/63219639554.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a64e869f8ed4d70e41a28f5975f0e5ed/nawavozezaxujeredowek.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fotapobiwo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16121bdf0d03b1---nakakepolaxedukutuxo.pdfIn PDF document text
    • https://atrax.hr/files/vovuzop.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/6180374739.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkucrtem46l9hdtsllhu6fa33j/fosojegirofogexano.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/gagevu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128d67005023---zedobe.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/37171840008.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa6e8b8e5---54273807586.pdfIn PDF document text
    • https://efnnma.org/files/file/21472475415.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd268c16e---bufexexibikopijutebigo.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/66410698216.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mdq5a5oq1o45qjt52fkt1qk8db/wobogokufosigol.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210720_122655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=article+2+section+1-28+philippine+constitution+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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 19000 bytes
SHA-256: ab53021aa3879b950bdc463c26e2476113b82e7655dfa63feedf96b6765e80c7
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 11048 bytes
SHA-256: 7e84e7b7cd712be5abfca7abed673e32f82d7a78fc2c934212ee33eec63ec95c
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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