Malicious PDF — malware analysis report

Static analysis result for SHA-256 d764e5110608b762…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 09:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be8aaa79c4b1680dce72a305a12ae3f9 SHA-1: ed9e7d755d7294f967f32b7ecccb82c75b89c9d1 SHA-256: d764e5110608b762bab885c88d503c4bb456bf2062b030afc0faeb522d3fe034
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting multiple URLs hosted on compromised CMS platforms, likely to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ic5qgnemth74nn9vej6l5p6c84/5934149042.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4e47e9d6---vidivanadujurowilan.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8c8544508dd6f121dde30325efe20719/79389171517.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160839a2e97029---45544714201.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/83120926741.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091898d7df78---18184191319.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a5193c66---limugibax.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/69a57cdf4f568ea50b1243cfeb0b5157/62067119859.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a503a979beb---vibejuwuperutoja.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b809cdc73---jinelupusonexurejowufu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150130_081310.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/mesuwikakudijegaleva.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/mutedofodakab.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e940621---vuwaketuvewasovoxaba.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/widoje.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcd00ea62---14520877263.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/m7po15udubuh4lakahqcd87rf1/23061126003.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b33226c2763f6e1bb65c52050f0a5d96/pudemeritoruf.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b594c74352---95678259340.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pko9fho2giiatnasanfcpuvjnh/88461354983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=math+problems+for+7th+graders+with+answersPDF 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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 18104 bytes
SHA-256: 6ff14d287dff6e0a31d42e46638b85a5a48ba0f2efd5594d6594a1e7eb8012e4
font_02_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 11212 bytes
SHA-256: 05c7712b94b3db7f7200949df7ed9dcdc11c8058611f2d6c2599f11748accbdc

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