Malicious PDF — malware analysis report

Static analysis result for SHA-256 234c2275ffafec75…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bf6d9221bca665b85d9de5468a3052d SHA-1: 43bbc455856f0aedd6704caa2fa80c05b0978abd SHA-256: 234c2275ffafec75c926bbb55b3b226da746306a091c7ee739e9b3b41fe3f221
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 sites or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ecodiagnost.com/ckfinder/userfiles/files/mogewesesa.pdf In PDF document text
    • http://dga.gr/ILC/img/file/lonopidupevozejutiwum.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614122cec4d53---nakijedekelusulidewanoja.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/puwisovukojugadanojagekab.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/bixuxosexere.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/xiwelijajuzaxikusujisupe.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fitifesamerosotuvifem.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/mopufogevenif.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b07f7eb97---99033551493.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/39807419039.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/72497318464.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/buronafuwizaperupopogul.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/76816998252.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399259457ff---21354376934.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/67771157419.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559e7df1ce---99477995741.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/kegejobavisunaganazoz.pdfIn PDF document text
    • http://boki.hu/editor_up/46195009446.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/11339643987.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zixajajuk.pdfIn PDF document text
    • https://tch.lu/files/files/wufejabuleketevak.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/rakumima.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/neduxijavope.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e9d89cb43eb2de03c2f29ff6fb8d0e34/fokufofopajexojunevej.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lesujebakejemujosomikesi.pdfIn PDF document text
    • http://dd-eng.com/files/files/nekefulelawuvilev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=impractical+jokers+season+9+episode+1+watch+onlinePDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 17476 bytes
SHA-256: fe2a0f2627b777e27e7771b66cad2eca3228ad85ebaae1d67cfd2b0ccd1a99ba
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 11260 bytes
SHA-256: e72abc9657684ba674507a00d19e87b0299950d04c1915369b27c7c4bec51d4b

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