Malicious PDF — malware analysis report

Static analysis result for SHA-256 86207b5c3ed165fe…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f437c65039265bab518e340f6c279ab SHA-1: f02497c97255219045e6c4149c550212725e9488 SHA-256: 86207b5c3ed165feef781e240d67ce6dd5ca11bfb31bde9519f512c4fc44bf25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of `utm_term` parameters in some URLs hints at tracking or phishing campaigns. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/26076009807.pdf In PDF document text
    • https://belretail.by/ckfinder/userfiles/files/famezaviboj.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/68617596076.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/94888068171.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/93154029937.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/77909254017.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/keboxinizexotuzelipu.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gafojidojenamekemole.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/xutuvunasidoxonopifenabi.pdfIn PDF document text
    • http://btfa.tw/upload/files/soxolugerozaxepe.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wujarijoxu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161420a737db09---gasuzezapisovovosajeb.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/54827689477.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/bilofodomobukilemajisapi.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15264645012.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/72684941551.pdfIn PDF document text
    • https://ambalatender.com/upload/files/46829364223.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/55839493499.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141667cecff4---sikasuxe.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/puvus.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/8379877228.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/37945173892.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t43mmc00jib1sobann55scsunf/98047050611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+install+minecraft+hacksPDF 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_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 15072 bytes
SHA-256: cc7eb3080b7a7a36135254ced25fee33043b479944328e8c6dc4f5a8497e42e4
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 10772 bytes
SHA-256: 69f826aaab48e4360c801602831033911a43391f98c55df2b56f1388a66e96bf
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1