Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19f2d6759528fe…

MALICIOUS

PDF

94.2 KB Created: 2021-06-25 22:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 441a40db224314d158507d9e0f8e0938 SHA-1: f1dc34e63e60f4caeb1e997bd5a9a09adf2ade66 SHA-256: 8a19f2d6759528fed0eb1761f019d8e063285c1965977e6bf3f145a79bf47090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a2c508bd0a52888ebbc22698c0920e5d/99314773636.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cff4029cf---22117081782.pdf
    • http://machinegroup.ru/img/outer/files/wisidujejifazu.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff2918e8c---57272117759.pdf
    • http://gift-founder.com/archive/upload/files/66623701229.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a5c24cf8---8992748307.pdf
    • https://santechnikosdarbai.lt/images/files/86794265430.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/mafavaneseparafiposulosa.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a94142b51---silalibol.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/449cb1ba3630536b80945d525a6459f1/tebimu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c548fc48ea033834782bf0d0693d5813/xepizapisiforilikesafino.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/lunirupodopasovuzop.pdf
    • http://www.anclupnapoli.it/userfiles/file/pigikivuvuloloxevopaxo.pdf
    • http://bukharageorgia.com/sites/default/files/file/47205156639.pdf
    • http://phuocthuan.vn/images/pic/file/18553324799.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2i9g73kqk5pdvkglp5rd9djen5/15791847953.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab053a770---41953159611.pdf
    • https://divinenine.net/userfiles/file/43162537039.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde3bf018c---72326693773.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a4da4250a23b2aafa8f15ec792d7a476/59245822937.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61aaa0fbe---18563695928.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/88ab9810daa329c7a5472a49b278e90e/66771706450.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/24540262825.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cccb3a77f88---12899136942.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=simplification+approximation+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 16792 bytes
font_01_sfnt_off00010aee.bin
947142c7bab26f2eaf25d81ae188436663cf7efde86cb9e9599b90cfc47a64f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10660 bytes
font_02_sfnt_off0001234d.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 16088 bytes
font_03_sfnt_off0001387e.bin
8685eab8b9fe9c032be262edd850503a4966d206c2f7df9c76034e1e52c05123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 19056 bytes

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