Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4642f876285b216…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8aadd9a0161f6fa96dee717604ffd9e SHA-1: 011e10b60700ed2af3693a6e437cc4a96d987d58 SHA-256: e4642f876285b216302cca9bc9f8d4cc774a12229032dd379645dd89b7f14ea4
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 WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://machinegroup.ru/img/outer/files/18538771598.pdf In PDF document text
    • https://mimpisiluman.com/contents/files/lekakupenanises.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/84006861663.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/dudotodaroxugib.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vamikabasubugurotesop.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/2538538124.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/nowerefogolamuguz.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/81540390182.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ok0uihvm6eu00k045nqbcsdlq3/polaromubemejinafuripe.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/suruligaf.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/kivukaxakejoje.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/57588157619.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e7929b8359acb1723e7edfc0eecbebf/95985108360.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/nujol.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/17822893800.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2dfd647ba---16732396171.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de80b9d481---81786205371.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xeranevonibutululenag.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/86632859874.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/zuvilusadupujabajizisatex.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90648364949.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/joxidefofefipaxiri.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/tegakul.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/45829890671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+shooters+with+controller+supportPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10616 bytes
SHA-256: 5ef4d66f7b8f9d0ab484a252db39993d913e08c6ae2e6846c81ef3b35d5ff873
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16956 bytes
SHA-256: 4426535793a56547ea6977c5b08cf5f180423c80b7306904f65afb336316a3b7
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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