Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8df8f4a14bcdce8…

MALICIOUS

PDF

107.0 KB Created: 2021-09-01 02:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d70d0fa396fbbce63de0d22cf959ef2a SHA-1: 89a9c0f08d7ab96575888ec150752b82b93cb63c SHA-256: c8df8f4a14bcdce899c5501133ddbe16194e660dbfb16c8a9fe5298b7dbf6db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://rowsontw.com/shopadmin/upload/files/lofaxotagojufibidukajoxut.pdf In PDF document text
    • https://distriparkbotlek.nl/userfiles/files/roribomi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/9461522869.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/2105072087.pdfIn PDF document text
    • https://tdfstore.it/file/35039286964.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/42327712628.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873122ac822---gelaxebuvebupitosedoro.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///21769170613.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efdc0cd6ff---vugox.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/32270693809.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/18700368786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd357f4163---bogani.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/lolekowis.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c3371ee53409e270b7f5c9a7679eea88/58072677143.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zaweb.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/totifeg.pdfIn PDF document text
    • http://keacg.com/upload/files/85714026488.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdaca90e7---96948760343.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/xetike.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/00012a55fc9de9e121a0754d97f1b073/duwaletegepobumuripadas.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vafitanif.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087da18341ee---27850897021.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/makesujevorivelewis.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8b283750fce2a2ea8f8f979165e9a706/vajemobonerowevuwexilemad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2+point+viewPDF 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_off00013b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 9944 bytes
SHA-256: 9edcac30853f52a647211c3dc4d594faab488a8200df6ad4dbd294180fff19fa
font_01_sfnt_off00015156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16968 20160 bytes
SHA-256: 8cbb8393ee505f6ac72d6875595d82a97e8e884b44c5a1f347fe2db5a38a30ca

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