Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5658560288d22a…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 00:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5538203863f996384595cc56c26c33ff SHA-1: 668f4c59c3334df2cdfe810fcdd3ef1f500e5960 SHA-256: af5658560288d22ae36abc09c020268e497ef4447e6bc7acc9048c454512013c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The primary attack vector appears to be users being tricked into downloading and opening this PDF, which then directs them to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f2bd4408---temefowomapovakozix.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab9731351---71610749490.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d574a3ad0d72aa0f53f85f5025ea610/77667138595.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/b37ouu1eb1l23v90lhdeslogd9/40591775909.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/fabupeg.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/66673068303.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac857eda813fdcfbceb16791e1830cc6/55575898745.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ffef4520c---15182674386.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5337f3caba649de1b2d7a0399b53403c/41864901512.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/72438780160.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160865f935c56f---22168079784.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xuvaj.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/24396669473.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/19c38a9eb02e38ae27a840a6c50d50b6/70469130605.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/tixulol.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/48855887413.pdfIn PDF document text
    • http://redactron.com/userfiles/file/10553925770.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/80922958591.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/63ik9lso394oknrc5vsp4vnpp7/27753642448.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/kemukujarobadevefiponab.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f632ce6c8e9151815e4a5c0fec97a2f3/1576131074.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5ca403abff365ed8bf772025c17069ad/wiruretubesijo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/59b99cc479bea1692d67309047a18908/95807606459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=out+of+countenancePDF 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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10048 bytes
SHA-256: 10cb6a08244d67ddf6637a3107dc3a3bcdefa64910dfb02e9e0473347d2011ea
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 17800 bytes
SHA-256: 4ff23eca8a02395dfe5e5c80b14382664ab73eee9f032745596af218b3def65f
font_02_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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