Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad62123111360fb…

MALICIOUS

PDF

95.1 KB Created: 2021-06-26 00:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8744199f769580a89d000b75609f959 SHA-1: 05eaa65001300c128df2ebd913da7aa30103caac SHA-256: aad62123111360fb012372ddcaf46c32e405fd70f995c9ce23312b9d33b0349e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload directories. The 'SE_INVOICE_LURE' and 'SE_DOWNLOAD_BUTTON' heuristics suggest a phishing or scam attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jotelek.hu/files/file/55679356182.pdf
    • http://jp-cable.com/d/files/28435433828.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b953825ec9---21582422331.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/828037419dee8bcb03f3c86edfb0f2ca/57360133759.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7t2bqgg6jmsvpl9vkmb7hpn3qu/17958415618.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1627b212fd---xigidife.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/b52l2i3am4i7fhlb8l5p39ksm1/dexejofirunumewutunazeri.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b5dd9ef---gavusap.pdf
    • http://bebelino.ru/userfiles/file/61262236934.pdf
    • http://atallmed.com/userfiles/files/64040443877.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efd87b0ae---gilirijuditeworolava.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e1663ba51edcab901c2d147a6565f5b1/69993747522.pdf
    • https://maggies-handmade.com/UserFiles/files/mibamuxivolabexebaduxa.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160832aa6657e1---90630386091.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mapu1j5ggj7rr8fu8vh1ne5acs/voter.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cl5hjhm2pk7nc3ki4hl1r8vpp2/semowupurokiwaxe.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f735081cf---fepadinilejewa.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tpel5apvgs00d567tlctejf3jf/93938567383.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2cf260128b89c174f216daa167b36ac5/pafozivalenekapa.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d00099b88---82957598798.pdf
    • http://agcslohian.com/userfiles/file/gipipi.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/00ec54593cab7c91ab25c218f90e67f6/fojalavipave.pdf
    • http://bscartridge.com/pic/degezozile.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hereby+letter+example
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 16792 bytes
font_01_sfnt_off00012c0d.bin
d58309244bfa2c9c0f5411c4867187f535b9e7453cf63046331f0c9771e0a9b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 10276 bytes
font_02_sfnt_off000142f6.bin
edafb21a05e1ff63061b4efb96dd5f026ebccbba498f46ddc3e47d05f5ade63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 17052 bytes

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