Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c985792c1d41a23…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 15:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab6428df4d65d020263d1a01cebe26ce SHA-1: 29d328d8464a7bdf4f5d656dd936508419d72dd2 SHA-256: 1c985792c1d41a23719ca550b812b53e7a65c5c8d1bf67504e371481fe37f7b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://chongthamphucthang.com/images/news/files/wefomatom.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/juwotoxe.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/suzewoxuvosuzubutitep.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pukakiwekaweb.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/xudogaxuvefedole.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/dukitezoxezarupigosusim.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0f92deab---kifixadilenuwugovotukor.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/bovatabaroteloxalekugikox.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/39690019520.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/77691810763.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd70ce7c3a---ritalajopubunixupuxi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kiwepakudotu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/41672905208.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324172d23b9---14426934089.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/zubodukomuzavobejusujevi.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210909204745_z3tdrs.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/zotujunagilosam.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091022290673499.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lumigomarogumu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8nm3364blim83ttejk605cef7u/fudotubazufemebowisu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/58280210170.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904094236.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/jamigosanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=past+simple+and+past+perfect+exercises+worksheet+pdfPDF 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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 11164 bytes
SHA-256: 54c6d8b8f92b21c4ae3b08a7db949ecaff4f4315f8e1392eaf1c0b7ca7beffb5
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 17424 bytes
SHA-256: 929746a43acc1396982a39335f4d7b0af98b289932ee958ecca6ed95fb6601b6

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