Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fda9477817d8e3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 08:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ff9c562af099fcb18ea7d23150aed73 SHA-1: 2d14d5e0bddf74745f2a15a49eae66bab2104d1f SHA-256: b3fda9477817d8e3cb79dcd3dcf431654aab13bfc2608102dee62a9e90f7cd62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The presence of numerous external URIs, many pointing to compromised CMS uploads and link farms on disposable hosting, suggests an attempt to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=employment+standards+act+pdf PDF link annotation
    • http://portalkucharski.pl/app/webroot/media/files/35402330183.pdfIn PDF document text
    • http://jfe.hk/userfiles/zasazeduwosufupid.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab320c2f19a---68504168070.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a0550dad7---nobevedafopuxabuf.pdfIn PDF document text
    • http://sartor.ru/upload/files/ratomixafikifajoliduvep.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160760dfbbaa96---67941335352.pdfIn PDF document text
    • https://grouptm2.com/contents/files/13101475146.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/95ddd0dfa9cf1de44154431036c219c7/kabaxamu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/pagalasemofurazufojop.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/7035341682.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/4984646404.pdfIn PDF document text
    • https://langumeistras.lt/i/File/zuzuginemow.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/15aa9b6ce1ade0294b4812bc90f47071/69564485302.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/7005609477.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/5018711402.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/gezevej.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cm2gbo1gru0trdhjmjgdbehs50/39353358989.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b543c6e13d9---wakuzunawegonibijana.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/55582489477.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b6485e46cf8---fuwexuxetudemo.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/widupexere.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 10784 bytes
SHA-256: ac2a3fb9192f3a546fe90df3533a64416dd859349c475c40d734773eb9be6d0b
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 17236 bytes
SHA-256: c1eeb2a3522edad853d43a312321ba7849fd6cc6150de76f154906e42c2f7a8b
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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