Malicious PDF — malware analysis report

Static analysis result for SHA-256 be64f4d150ed7eaf…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 03:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e790e9e2b43d5c0cf0bf8b6df71ba15c SHA-1: 83b6fef95bda9b62a57f6960dd4b70e0f007423b SHA-256: be64f4d150ed7eaf40095e8cb09e4869a585a2218f55f27ad1a4bedcad91982b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The presence of these links and the nature of the hosting indicate a phishing or redirection attack.

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 https://huntic.ru/uplcv?utm_term=guardians+of+the+zodiac+otome PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff949d311---89593535187.pdfIn PDF document text
    • http://gugugroup.com/userfiles/nizoxivilogeze.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54272662167.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/tulivupobijenavemigalux.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fuwubepadeji.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/65041269746.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b325d0c2de---visexegipuni.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tuwevatalujupifipupanakux.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/30689352209.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/9957346784.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/4339757626.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///48848552710.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bixomigalova.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zajogaperokodeb.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/86701420373.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/jebiwebogemoxuvu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021833039738.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/gobokoxivebiwipoxuba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390fefbd903---9085242363.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/28471046492.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901232323428620.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5f329e3a04e8002fd3a2a8b8f4875d96/rulojotirak.pdfIn PDF document text
    • http://boxethai38.com/upload/file/7472559007.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_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 10896 bytes
SHA-256: d3591e91eb13793847b7e796c9d549f67e424b7685757de318b96628705c14bc
font_01_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16872 bytes
SHA-256: 86441eb34f30aed6e83a3b3cf1cb54a6053820dcd001252cddd2b78006cf9803
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1