Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42901009081df55…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 09:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c31036031990d82a71f4bacd641f2d82 SHA-1: ccbb33fbb1590ccc5b296501c7464b8d29a49311 SHA-256: e42901009081df5572a1aa9fbb23eec98ac4277a57c37c1085b6b5edf4b7455b
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of a QR code lure suggests an attempt to redirect users to these malicious sites via mobile devices. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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
  • 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://cnpair.com/userfiles/file/xipujagemunakixubef.pdf In PDF document text
    • https://trungtammatnamviet.vn/upload/files/jekalakazaroxizuxizefipu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bajarejimenosulaxo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bupojiwonuzaxu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/36060977891.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5aa819a8---lilov.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec23a4e139---95302159732.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/665forl6g19rf9uuqchchutgqn/1275808539.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/savuzamoto.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/kexilekosomib.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/kejupejok.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/naxitokogotemajuseropoz.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/dagidigomu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n263qg4gatcfvqd80ao750lph3/kebelir.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d227db824ed1371b1497868fe1b8e6ed/3254307019.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nurag.pdfIn PDF document text
    • http://pronobile.de/catalog/file/3536853825.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/poxaforituriro.pdfIn PDF document text
    • http://slovoveri.org/userfiles/609238291.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/sarexabarituzoxowa.pdfIn PDF document text
    • https://motecx.com/images/file/55022615888.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/sopugef.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/povala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+android+camera+scan+qr+codePDF 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_off0000ca55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 17808 bytes
SHA-256: 00bf1be7c42bfc099c8513adb592a0eafabd9504b16499b50beeefbd1c350e1a
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10564 bytes
SHA-256: 4be278e388c356ad8caa55695f82110ed45064cbdf1dd8f7cc408c5511bd85da
font_02_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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