Malicious PDF — malware analysis report

Static analysis result for SHA-256 686fb6bb343cdd1b…

MALICIOUS

PDF

91.3 KB Created: 2021-07-21 23:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 012484680515910fd7299b17edc1092a SHA-1: 053ff31b95d331ee9700077a8361e611e64e6158 SHA-256: 686fb6bb343cdd1b31e81af051cb98630b5a4d0e14f53751d0416bdcb6c61691
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://arch.ua/ckfinder/userfiles/files/5146368596.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbac349938---dufarajomi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bb833d88089faa0d792b1b4bb75f0249/vatipatetebotenirez.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/dowugagolenafuzazoviloz.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/zigoz.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/074f412937dee958af387023642bbfb4/3942209341.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pin0auvh94l6inhibbn6s6f2sk/14974435861.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a265cd0b2ff---xarekufusebigevejibafu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b98e9b3bd1403d31ecce6d5b45635266/xutonuwugexepizavi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zifinaweforabejafazeb.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/forunudekud.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/82825068026.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/7fe4d9a67c0d838de329ce57f0aab277/xunawekotizuxidunanoz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/trbglr6rvp4shut4io42r9c1h3/tanusubokededezi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e023e94c693---nufuto.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/59731858919.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/iqb7acdma3ace1uvd65h076uef/fepiju.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/fujejozovotijawapu.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/56072746240.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/74447378373.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160735a4e8025e---8362679997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=alone+without+you+by+my+side+if+you+love+mePDF 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_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 10844 bytes
SHA-256: 6cd40b618cf6c268b182eb617ab1fffd336f4e705128e2ea12201e0e7bbbb1e2
font_02_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 17136 bytes
SHA-256: a176ffb3cf019d8660789488575d57c2855b36dd8d704bd1b494436e6e2fa013

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