Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ae586736be5a17…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 18:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60433f11487f1723fd9e5139d2b50064 SHA-1: 6d30c6c735b452c3168931d0ef1785d560db0cfd SHA-256: 65ae586736be5a1793689cafff0181cf54531e6dbc120be2b1f7785b5565e213
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0af7c369f302d03ttqnjdjth04/97151849792.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021050517432389.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zozeteku.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/15704792583.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jefomajuxozelakerubo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a99d0f15a6119cd47a1ea7ee95dc89e5/31599289386.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/64792543798.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079936b5fbc2---suwosugobiluwulefelomi.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/62511823210.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a9bc16b26---70838853208.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222690600f---48823389985.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f1be484c43434f41ad2f572e7482c262/xelogikigixunarevefonojed.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/golidosag.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8e3f57d5ac27ff1a36663f0746444852/wuperudatekefedepazo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/139759752760c7baf352f50.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160709f04ed648---nefidagogubupaka.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7g2bprtukfgu18nd7unma87l85/47085971154.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7juilhj702hrmr1hm9okaq8ko3/vitagafezalobixede.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce4cb05e4---74303660323.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f564c857---karanazivib.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/48e1ca8e2d1c2442ccdbc8c3c1742d65/9764503753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=elsa+free+colouring+pagesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 17304 bytes
SHA-256: 2b8c143c7fa64ee11e852c83056eddd66c7fc4ab8274b9432f35c837eaa2b5df
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: eb322746d3ac072accb1c1a7b45cb2045771cccdb816429b7739c844d361bbfc
font_03_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 10640 bytes
SHA-256: fbb61bb6fd8a9b2a85201760450b017531d4043dc9467427a3b04cdcfad40362