Malicious PDF — malware analysis report

Static analysis result for SHA-256 e955602caf51bf73…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 810b5fd111929c6e30d112811a423e69 SHA-1: ca6691ab27d428368a05905bb307c91562b14e62 SHA-256: e955602caf51bf737e112158805c2b96ed04264e59e00def3758feb816995510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple PDF files hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763839057d3---89984201983.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/pividonuzevetojiv.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6cc72ca1f31308aad1b02038e71e6342/gufonosone.pdfIn PDF document text
    • https://digireg.dk/upload/japuweki.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77312528003.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/14439393494.pdfIn PDF document text
    • https://bauarch.bg/files/kexoxexugubagaligazoje.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3c6332ae3b81fe0550dd9114a7609865/wologumo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/nodasudifajavokexumarug.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/69845983984.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/37940071262.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61de39340---69780811953.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa32438500---tevotozowolawi.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/0k675qjfrgioedslu1h7bcb6bk/vepedesavaterevawuma.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760c7d00b86---84283936395.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/92910780735.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/63214203196.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/74471371579.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210523180029269.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7675ff99865ceeaca0b3c7c07aeffdb5/wekuw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7383a07bb---rizomuseveraxadidaxagew.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/59993387294.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2k8fgn5j2dndkgkn6ttu1k7c21/30124240072.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9250d832a7ecb5ab048334de0f2bc4e9/84544098070.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fukopuxupotokeroluzom.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107311345477527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=algebra+formula+list+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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 18376 bytes
SHA-256: 3292018b1a8ed8cdf21d95c662d61b5fc994edab5b46b1ee98ea1f751106f34e
font_02_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 10960 bytes
SHA-256: 2f3d5aaf5cdcc42d7be0143edf3d7038a17730a6f9b609eeb5b441b7ae88079e