Malicious PDF — malware analysis report

Static analysis result for SHA-256 86adde8c0e800330…

MALICIOUS

PDF

79.8 KB Created: 2021-10-18 11:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33f9f0eefdb32de0f543d73011c7b83e SHA-1: 0842ce4e81f9eecc6df0861ac5b5550020617d49 SHA-256: 86adde8c0e8003308f27b664aa24a6a67d99c474cde8559517fe72d6134a1def
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to various compromised websites and disposable hosting, likely to obscure the ultimate destination of a payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of numerous external URLs suggests the primary function is to redirect the user to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=all+inventions+and+their+inventors PDF link annotation
    • http://lyzph.com/userfiles/file/Fl202109171205183828.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/93033612432.pdfIn PDF document text
    • https://akemi.ro/hirek/file/tesunujukipuver.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/vuzoxunosoji.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155bfdbe5e1b---relumon.pdfIn PDF document text
    • http://come2menorca.com/images/file/sajuxifigifafimugatibub.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614d32c222eba---kanasirifubamaxop.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616a17c341e74---53320995830.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xenef.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/47741276413.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164c61733c24---58085086464.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/91444382766.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/xukenaze.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/3269062165.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/23201341850.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-10-15/20211015021528544041.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ca642533---tewebosidakosodafamaxiji.pdfIn PDF document text
    • http://goodbox.org/uploadfiles/files/20210925_051138_6454.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/85029422434.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/vakogef.pdfIn PDF document text
    • https://renewone.de/files/sugoramasejivefepu.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/35737455009.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tofatavorakoj.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/49533832636.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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 10392 bytes
SHA-256: 84139b9321788a2cf96d006c93068b366ea0bfa6e94d64057f9582c45a6ade93
font_02_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 17432 bytes
SHA-256: ac5fe5c5dac8691a1eade99698e9323c59406c99e24fcde6da4d079b4d41ba21

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