Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0b4a24e0e7bcdc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 19:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63a7f34de161337d436ebca5de6c4e9e SHA-1: dca79610596526169e8d2e5f33669737c15765dd SHA-256: 2a0b4a24e0e7bcdc64fe2c0cd8b4c32cb1a83a55f6f944b2f868fb1cb2adef15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised websites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/114e292a34c0a3b8bcfb38a57ec34ded/titop.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/22205009057.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/wofelunekogukew.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/vidijelipasafepukikeb.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/92296632532.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bapazu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335a655b90c---terubotebobo.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rutot.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/65334717943.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f185442cb---lalawixuzuxoverawexibo.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/96456425895.pdfIn PDF document text
    • http://taociren.com/upload/file/210903025453968502hcvjhk0bxsmk.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/46500022146.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/67196776186.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/50365688540.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/nagoserafetukomi.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/44298305732.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8eace467992505ed277a5478205cdb42/xevurabigek.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/53926766005.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/bitoruzolor.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/famavukusoxakusariz.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613284412214a---56185819846.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/vaginedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=world+war+one+propaganda+worksheetPDF 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_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 17612 bytes
SHA-256: df64ac056c8ed9235a4335d5f3d92c622a434db871a832d61a4f30b94c1999c1
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 10748 bytes
SHA-256: 5c0b12937e5b7504c80c2e2bff101d1a940bac2084553d116232af3103a792f0

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