Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be0c1b5b511b525…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 12:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57b7f380eba999957b6459296be8b52c SHA-1: 06aa7882338d737dffb2acdd900da73a74782728 SHA-256: 0be0c1b5b511b5259d56cc2ef4e48f6f9b1c2be99a9752bf7bda46bd98342b8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking, potentially leading to phishing or malware distribution.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=photo+song+editor+app+free+download PDF link annotation
    • https://noursportevents.com/wheelmarine/userfiles/file/bivemusafadotukanudawenu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lozexobakanabuwosoxim.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385037a0fed---20678762207.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nivulanepafuvo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa4e68b8a---sigonawinatat.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/62724923022.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/26650751461.pdfIn PDF document text
    • https://fivetc.net/uploads/files/figiduduwexupiwebixeviwo.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/letuwoserim.pdfIn PDF document text
    • http://orenprom.com/img/account/file/sunatawuvasazi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/67867283599.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kedaku.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitilobada.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sawekizawuxaza.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea46fa514a---soxarusujabagibixulas.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/duguwez.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/kaleduwaf.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/niduzazipuguten.pdfIn PDF document text
    • https://ip-pharma.net/data/files/wigepabaxetoli.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/lemusavaluzobiredojalup.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/malujogepob.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/doxopidokoberulewis.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/zivirare.pdfIn PDF document text
    • https://koratspring.com/upload/file/pesazukulelewi.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/ludada.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/tawisedexi.pdfIn PDF document text
    • 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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10864 bytes
SHA-256: d770adedefbc75ff1aefba5632215dee42de06d0a8d93891b9ee18638c27ec22
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 19248 bytes
SHA-256: 636dd2b995fc08dd118b3e3c02741b5aceda975e7c68420b51ede25455fd0e0b

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