Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45dc37d258ed41a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dafadcb65263645b2a65eabb47ccbb4 SHA-1: 154e892a73074ce6c3e6b91db84c786f89c11f60 SHA-256: b45dc37d258ed41acfec8fa983f115a270129c27d2f961f7aba3a38fe352dea5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to external websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://keramann.ru/uploads/files/jaxosivitojemudox.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/42649372138.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161034327e09e0---92299607171.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210706150424184.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/xorikewinasusu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73f99cabb---tupolalebon.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oeh4qka2a346ngtqn525mjb7o2/nujobo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/visugasufemupa.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00274887---39619502025.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/81233155519.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608782bc93299---dilizadepokejuvosegowuxa.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094abcb448e5---xutenexumexolavefapur.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1345605255---sudemugipugilexaji.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/rululumijobo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///67311733132.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/43534812230.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mivepapubevaxadojolez.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/75514908110.pdfIn PDF document text
    • https://wasael.com/userfiles/file/85075188523.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/74244414291.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1627434096.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/wizurab.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a913fa2f---jokoketolimuruzisumaxupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=privileged+and+confidential+document+disclaimerPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 19752 bytes
SHA-256: 4b7061f0279da5aacf978776911ef8c9fb615006c2228cbcd8f63505a119aa62
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 10984 bytes
SHA-256: 77ad1d8767736fc88afe28e334a62b33bdce34215d086d19ca548feacce7d7b8

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