Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc55dde3745f78e9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 16:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f730ecb3d6e79cfff60c33b4e98cb78a SHA-1: 76c04f281018d01285b536663ff45fe484380229 SHA-256: bc55dde3745f78e969f93fb4da57a4f2018c93ef8b6ee42e2649d29a6b8a19ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161325c91034ed---57312766990.pdf In PDF document text
    • http://lesmashclub.com/imgUpload/files/70534138754.pdfIn PDF document text
    • http://donghotam.com/luutru/files/runomiduzinovuzefapis.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7a6357502e79e2deea9f1d659460ac28/11725827744.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5384f300ed46efab98d1129a5e83244d/19414697814.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/suvokofaloritesetosozefox.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xisuxidud.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/botigapojola.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/96307590637.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/5376441334.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/dodexefezava.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613213673a6f4---20993812073.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/11376503235.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/jufiv.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65359608400.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/wudoborunuw.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/xijapawuju.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/zeladolavapajut.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/39403294817.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vimatadugofixij.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/bisipijabuziwelubese.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea12aa9467---43764739467.pdfIn PDF document text
    • http://trivio.it/userfiles/files/fevabuwogijoziwiboxofelaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=send+book+to+kindle+via+emailPDF 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_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 17532 bytes
SHA-256: 3ae1061375ef2cdaae284962c39f1847c1d70ab6942d8691374f7c2c8ca0f177
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10512 bytes
SHA-256: 12e18661ab4684d467192ce28c6a41b0b8ef33835e9766133f0ba6cd69784ab6

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