Malicious PDF — malware analysis report

Static analysis result for SHA-256 428a111d3dd57041…

MALICIOUS

PDF

72.6 KB Created: 2021-09-23 11:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f66e0cdbb9661db23db2cf8befa2f6c SHA-1: 1139c8df711e4a72917350ea7759f4aac5e53e85 SHA-256: 428a111d3dd57041352972757438d287ee95fa7546782b72a819dc0750371539
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of a QR code lure, combined with the nature of the linked URLs, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e59b92a3---tesuzuvigaralim.pdf In PDF document text
    • http://datcat.vn/2018/file/87288685913.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/90744686275.pdfIn PDF document text
    • https://agros.net/uploads/file/53428825071.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/19826270520.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/45737209767.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4850398d---zujew.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/jetirosajat.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/68706057101.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614becd1262a0---58815001850.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210923051951477.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/le98ieknoed4ulfpbb512dcjl1/48317671208.pdfIn PDF document text
    • http://fitviewer.de/files/file/92512295089.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f735b6b10---kelujadugovipufu.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/baloninunaxepi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52b52e1a3---18607185276.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/pitura.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/kuluxeliremekolofed.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/72848574584.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/78057502959.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fd7fc6804ac558da50fa8760062a7bbd/bumot.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/guriz.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210908_3B46D0880F3AA55B.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161345ed7bcee3---dofufukapuranuviwekom.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/50009741012.pdfIn PDF document text
    • http://skupka23.ru/upload/m/90026450620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=qr+camera+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 10280 bytes
SHA-256: a2648412d6cb31547a872f7549338f8345378dabd74b644fc2b138eb647b0e4f
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 17296 bytes
SHA-256: 4e4a5920ad6ea3262c6874e70864f5c7a86d2b76e6c866036aae27a505204a6c
font_02_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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