Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4234ec84861324…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 10:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84d8ec4ccd8c49a02662cff3dc98707b SHA-1: 616e8e67db0a32bfe40c29b2f080444f5703f45e SHA-256: dd4234ec84861324b6138d349eefc4e3fa5e55f1d9410707efebd1cc2edcc209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, several of which point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7f8ac4f---pupamunewojepogi.pdf In PDF document text
    • https://ekoelprom.pl/public/images/editor/file/33315433769.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/49324654924.pdfIn PDF document text
    • http://soupworld.de/upload/file/33045887126.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14484499246.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/34198752026.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/paleji.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/51133678597.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/35422339252.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/59554223928.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sefikedezizemaberebir.pdfIn PDF document text
    • http://qdjshg.com/files/file/zunikipasatubojelazubolu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b76530f555f3c2bc7f200a182650075a/68860220106.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/sarutosowanovex.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xuxun.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d8b27f6cf59d327322b7249ea82b55fb/jotixiv.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/81285374869.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109190715586537.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/kukopof.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/82141487230.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146801283d45---4659212694.pdfIn PDF document text
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/janawanupixosumigivewo.pdfIn PDF document text
    • https://zagi.hr/files/negifiba.pdfIn PDF document text
    • http://clingac.com/d/files/fifilumesoba.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/79103010135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=alpha+vnc+litePDF 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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 10128 bytes
SHA-256: 92ffe290a0e9b16c0016fee14a4f40f4270dddefa253dd34de72f686bb4930c7
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 17792 bytes
SHA-256: 9a575ef59d63048897957a0ca09b4f757a75e05f63213fc5b84cf28beba0ddf1
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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