Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daa6a37e5e894b2…

MALICIOUS

PDF

80.6 KB Created: 2021-06-06 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4db6ed9cc91962f7a4c5dbee8f851a3c SHA-1: ab8819ad916426644631f24dbc8bc7f8a30fa536 SHA-256: 7daa6a37e5e894b2c27dccb87b58977b0c287ba128a51511aef305885df06eee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classification and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to 'Ielts general reading vocabulary list pdf', suggesting a lure to trick users into downloading a payload. Numerous URLs are embedded, many pointing to compromised CMS upload directories, which likely host the secondary malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=ielts+general+reading+vocabulary+list+pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qtln7n47egu0art244k2mohsin/bukezuwagigo.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89147ccab---29015651436.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ebcde6d5508f0fe0f96f4c9ed136d117/nutirojotilidug.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/01c01bc51361c1cd22a57010d97c65d7/77878083449.pdf
    • https://ibeguiristain.com/userfiles/files/40363124626.pdf
    • http://promocode.lu/userfiles/files/sukigesonolo.pdf
    • http://ajtoablakcentrum.com/_user/file/34016028545.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9436fd3f05312469376d4dcc8bbf9245/jariwibosomavivanajij.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb34b00dc---48609742625.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/9632751964.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/61471545388.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/947adc6ed6dce9cbf445cdf7eb6accbc/nokasekalisadapisipaxod.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/i60vq0p8qeis7ibja2fbfa5qc0/41110755703.pdf
    • http://notarbrazda.cz/userfiles/file/remopot.pdf
    • http://domholidays.com/userfiles/file/744970746.pdf
    • http://softwarefactory.nl/images/file/zisojoli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcea.bin
52e42c798d060163ebdbf106c491f484933d86071fc94961e76cdba0a6649e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 5564 bytes
font_01_sfnt_off00010fed.bin
ae61ebe6f4aa9978d818e69accc9fa6b60e2cbe45e8cd6b8a0c5b1ba6fd055ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 11000 bytes

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