Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9e53ccc9da6458…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 11:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 739428eb3f7253f31a02306abee962db SHA-1: 69c385231c37b77cdf29dbc07a9a42830d867a3b SHA-256: de9e53ccc9da645890e949239c322bc8f94d24dbcc952ddd1c1dfcf50e3e6c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=grow+peach+tree+from+pit+indoors PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc8d09f6a---zezuxogejivel.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/35521768288.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/28127756233.pdfIn PDF document text
    • https://biocoils.com/img/file/29395041909.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608b061525ce2---burowatejijelipiwir.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fe2c95fb8dcde1bd691eff4a7a7c345b/danabufepabevibekizes.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e85b9ab5712f186d2c45a77c1314e350/virajevotomasal.pdfIn PDF document text
    • http://keramann.ru/uploads/files/36111382068.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/14523335398.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5582b4a62e---15355477002.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e15fb24695---juvidizalexoselijeg.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d47f93690---xonova.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lpsqu9b7kj2ug5chbr2e6v80u1/radebozoxab.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kulidorixakelaxamipe.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/17762990658.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/smj00ck1k9c9i8d68hjmm6c0fq/kefewimokumoxe.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073062980444---zixiranemejinozinuvavo.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/7823074276.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/83507847101.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/664832623.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18391763298.pdfIn PDF document text
    • 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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 10964 bytes
SHA-256: 9d9f22e7143a4f742578c346a37fd02238465c21eedf5b6b7abc5281d27ea9b2
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16772 bytes
SHA-256: 2bb03982b44c141b5caae9c4a731b440b5a0bd981f6955d49bf19198caaa9f92
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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