Malicious PDF — malware analysis report

Static analysis result for SHA-256 4216d56cf4332237…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef5cb0e02b8a701f03c0c168856eb902 SHA-1: 36f45dae42c642982a4f03a404ad9ff9ee4eb322 SHA-256: 4216d56cf4332237a3f67d78717d5192f6945e0c7d5b8f295b2923edc3a4fab1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The embedded URLs are likely intended to lure users into clicking and potentially downloading further malicious content or submitting sensitive information.

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://cluboutletmoto.net/campannas/file/zutifaxerajatow.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b1ce26a8c---pedixepotirujotolijimon.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/nuxuzujiretidodakoxoku.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kotabifigazog.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/74467451683.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f430c6e3c7---74105127578.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b86d37f4135e072229e315769b865309/mevajesosubo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/92659772473.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e20e8f3a0---62301234086.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021070717080880554.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e8f89c343bcdfaeaa0b019919072da17/66611882418.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vejobaboritujamedafuzano.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/72823648812.pdfIn PDF document text
    • https://tch.lu/files/files/dutovadoxil.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/vilapoxedikiguzox.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/mefegulifi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ef5na23qo5l84s4vgk9g10l6uf/sosuguxugokidizamebif.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/48340355445.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3oqs2qb2a24sgds0gbn344bnkd/44763734990.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/aef0efd98414be320cff5f49199f21ff.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210831155652_5h6xe5.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fba6c77a7e0---kanenotaferod.pdfIn PDF document text
    • http://prestopc.it/upload/file/12778655308.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea4fd9217b47851670952fd275771e90/muwunotozikowaba.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/6197d142d21070bafbc4658ea2c9bfc7/10073028269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=apartment+building+floor+plan+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_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 17500 bytes
SHA-256: c261d3ec67057ba07bf2a639d5e7ecfdfc6f04ed81e418230273b1d4119667e9
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 10896 bytes
SHA-256: 727c68e09ab66e2b7f7234374466d67cf69a638e82313ea865389f714eed0a7d