Malicious PDF — malware analysis report

Static analysis result for SHA-256 36babed71b3fdb41…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 03:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 871cc40144cfc54ef57633447228d0a2 SHA-1: 16ce7b61742f64ddd0b2d05a994d00380c4a275b SHA-256: 36babed71b3fdb41fedd10b326f9a3477c34934373e2a4af712bc8f0b2a1a469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded links indicate it's designed to redirect users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://oniceh.ru/uplcv?utm_term=football+live+stream+free+sites PDF link annotation
    • https://bankubezpieczen.pl/userfiles/file/nabamelemaloji.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/17436351602.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vaduzu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6542455e9c4a9e9ca39e0f27c23a840c/92785049284.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/doverixapavufu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/tivawaxekivoxatijokozabar.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wagulujevomitomeme.pdfIn PDF document text
    • http://delve-cr.com/uploads/gisede.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210917063752.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/raxufamifonipa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/69677827465.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/giwokolo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210903155644135.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/306574ebf301e986168dc5b2c91f6315/muzufumewuvoduwovitiw.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/rumifokomebomuso.pdfIn PDF document text
    • https://digiconelectronics.com/media/zefubawaveliru.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/vatedefasuxedepujuj.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/20582272501.pdfIn PDF document text
    • http://ihdbd.org/upload/files/logigujipezokakedunokuxe.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65faf3fe7---duvuxomodesijepigomok.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gepudodowasujuwufogulozip.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/jeziva.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/76475290760.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ctk6llhvionf7e63cms1rrjmek/nozolipisomafulela.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 17476 bytes
SHA-256: 4dd2fd30ecff17a1084fa2ac841af1b1ea99bf1726404aa1ed7d233248d01bb3
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10452 bytes
SHA-256: e68ee5247edb2811f44c8a88d3aa50cb6c12998fbd77b3563e408bfac195a6a6
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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