Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60816f0ee153f04…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 02:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6904cad253df8ef5ac1e7a4650c9104f SHA-1: 9508a717834f37f9e7f42bf4b4cf64ac761398f6 SHA-256: e60816f0ee153f04c6bd352ce05d773329502ff5d2348936e76e2a4bd8b2cb81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF contains a link farm pointing to various external PDF files, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://noihoithanhtuan.com/media/ftp/file/dufokuzawajevinewinozimu.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/88151292565.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/waxovixomumapadurida.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/gixexopemezifibituxot.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/77628858183.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210722211730.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/gopafajazebuki.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce3bfdf706---84684106295.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tumidubedil.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/1854148626.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/vasejepenudamijilarin.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/56813737302.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161234fb4058e8---gupekokajoxufulumofepop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c68ce5b2---48280003232.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rurutametinolomofoxevel.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/pimaduraneriv.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb1a632c0c---49608744880.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g0uk13kkhpk0dst98f8m2927nm/43559836190.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ec39b95561607f97594ba214ac75f3b/59810469680.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/senexawego.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/gedakojujusebudoboti.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/periz.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/33564356542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hvac+design+guide+pdfPDF 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_off0000be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 16196 bytes
SHA-256: 6edea201334acadc10f6e21208633ad3b0657bb68463186530abbb490b672f21
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10588 bytes
SHA-256: b42635223ada867a6c5d9f5448e1dd71fc78d62a644bc272d9ed13fd9a968548

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