Malicious PDF — malware analysis report

Static analysis result for SHA-256 d455eae7fca1a42d…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 09:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37e9bb0a6f4272dc9fbd9c9c1f1018f5 SHA-1: f254f0217471542ee6619c8083f731a8d982550a SHA-256: d455eae7fca1a42d77018f408d76a45590dff20c0df2a064a42807fc6849c9bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8cc15062fb204b5dad5a7c1101b3ab95/75563834622.pdf In PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/42866091605.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/losesaxame.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/femuwazil.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/96102003333.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/trbbf1kjes2q7p71ljshde0ton/vikefabuxe.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/suvojik.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sevatosuxel.pdfIn PDF document text
    • http://dezis.ru/uploads/files/96760061120.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab26d97093f14bab4f55346b1f91cd06/dumiferaki.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/42360915088.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/givakixipazivutagunofijox.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440fb5298b---ruvekosaxirumizudupedazi.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/tipogasupup.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/524e084256536b8a16ec616df784973b/gipemaw.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/11243652408.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/dokewatupezitavisubive.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kunivefuwene.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/56842599944.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/dudavujuzolam.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/3065217137.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lulevim.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/pagutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=1969+shelby+gt500+eleanor+for+salePDF 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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 11204 bytes
SHA-256: 79c4586af365b4b5e06f4946bc917d780c4627cd127fe58839d5e5c1622b0ee3
font_01_sfnt_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 14596 bytes
SHA-256: 709530660d579fb05d12e488c38a0fe691d51d9a97e6ab27bbd11893aa0612ef
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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