Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ece867615f00dcd…

MALICIOUS

PDF

78.5 KB Created: 2021-07-16 10:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58ae93b55015272bbaf84983e8730a30 SHA-1: 3ca7e5482b2427fce24addff69a6b04d32e38178 SHA-256: 8ece867615f00dcd9beaed6bf51e89539e85bbd17adf8f556b2be08966f00080
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092abae4360b---75131166339.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/tilimuvisoxidinobutumog.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d909b54344---96959327444.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/rgsb6t930a7u7buspj8jlagja4/4930193794.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/mozewufejejilax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab11b39f0---vabepi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/78106619147.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b03ef5f6d455153f9b7acc372ddea6f8/35509655250.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/94bc03da5b2e9f401c3e956940ce88e3/funixenagijigad.pdfIn PDF document text
    • https://nevisnews.com/userfiles/85309494456.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/dixiladonujiz.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/9003571592.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/libovevipipilorewuwibuku.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce7b39607---62188740530.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210612110934_0ake4g.pdfIn PDF document text
    • http://camwater.org/media/files/12584266171.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kemexuzun.pdfIn PDF document text
    • http://whatdwellswithin.com/file/55505236589.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/genezodopijuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2e9a4d55---konoxupatamivivokipenej.pdfIn PDF document text
    • https://x-software.cz/data/file/19912077618.pdfIn PDF document text
    • https://makenie.com/upload/files/ledirilevufamu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7n1mmcou9sb95h4ma575vjmbh3/1335048240.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8dfe76a068ff5ad97dc376f93c377246/18399886401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=1+puc+business+studies+textbook+in+kannadaPDF 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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 10748 bytes
SHA-256: 7b1fcfa12e399fe0c0335470577febda8abad94b7faf3b18f0cbcfecc314b892
font_01_sfnt_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16776 bytes
SHA-256: 8036a4c01d71dfc6ef975131a8be39b4b1157e7c45c4bb550f2136e581d1ccb6