Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ef08959cf4db1d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 15:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d26e559780c88ec24b1738126e36ff12 SHA-1: 900f506c005b987d00f1634f69d1e6a476ae410d SHA-256: 50ef08959cf4db1daa4c791aeced2e57bf20aeac605308fb6c0331f37eac68c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to exploit kits. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://biometria.pl/photos_fck/file/tazedug.pdf In PDF document text
    • https://thefertilizergranulator.com/d/files/80064365928.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/nexelepigogokivazudibexa.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/62530198978.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/liredunaveperikedawakul.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/53292696569.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/26354402825.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/regupalavegaxe.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sibejo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/54200282879.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/narorunonemajusuze.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wilovadozin.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/riwabi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd8c539a3---30611728047.pdfIn PDF document text
    • http://asja.ua/userfiles/file/68876389094.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/49369862521.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hd2qtu0249h80hm9riqhri6o9aaaa260/wegex.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613117a1deba0---29756506606.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090513423095.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/kevumevazawikego.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mobojukukiboguw.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/5299361079.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuzebovaraxuviziji.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/20780360385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ehrenkranz+growth+chart+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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16792 bytes
SHA-256: 5616003207e6931a55a745a142cf0b815208c22e5c02378974601a989adbe2b8
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10816 bytes
SHA-256: a5e79432c067561acd60d5595c518ae2ae1550b3752a85562c5a445a11889dbd
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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