Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a173ccc524764b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 18:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cad8763e732680c4d35eadc96ed67a1b SHA-1: f62361a31a8dcd9bc7b260cd831c78858f9ab8c2 SHA-256: 83a173ccc524764b3382fe3019c8eac0508f44288e91112a5f537d1e7a131bb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://nomylo.ru/uplcv?utm_term=massive+mimo+communications+pdf PDF link annotation
    • http://www.lebedosapartotel.com/data/yukle/files/69952105277.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6a7cbb104dd79a8cb6bafed363b894eb/87292712723.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/95254765999.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hf60omhtgagk1v6nhilestgnh7/66852963706.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/67081696858.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085726157849---94565588147.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6d2f2997---78635488576.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb562ad61---siriwuzatalogolutuner.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/psunrnrq5kiins3qg4gfc4ec95/zezawuwirawusatogebuwuna.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210801064757.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160778d08da31d---mukidalu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1fba44515232dc9e3db971915a118ef1/modololosibipep.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/69kp998gcshiir4c1vseso7qe2/fikerebiduduxogulafijuro.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d162a6b6---74781952017.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d94c4a00f6f---jewolaliwixogusafetif.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/23780300718.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/dafimudodeperitomejexad.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210601013818.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/saresopulebefemowoz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b632ca50943---48768466162.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12353868b---vegizudawazomefijutunapiv.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_off0000bd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD62 20980 bytes
SHA-256: 6635aca633914ae57bcff9869af5ed65d252f9fc8b99832fae8e8d15b59d84c0
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 10792 bytes
SHA-256: 76031fa0a874e1ab15492e486313ca614bba9c7cd2121e65492d6940bfacfebe

Open this report in the interactive analyzer, or submit your own file for analysis.