Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e53938c89700c4e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 13:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b297fd2ddd783c36bd4769dd490b14e SHA-1: c69af354ebdb794ee1ecaa8c15068837da19adaa SHA-256: 4e53938c89700c4e0167162f16cbad637c8396c12dd9dabd537a8af29caeb99c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The use of compromised CMS upload storage and disposable hosting for these links further supports the phishing and malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=net+shapes+worksheet PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/771d49a4250e4db26e425b1eb217b38b/wudakosivugil.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kuwexe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661499f8c6b8a4e8d2e180cf95539b6b/16496822194.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lawetenavofonodukep.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/32589211882.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4c025837a7f7434a3ad609b7273055cf/71145584368.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/vonakopewaxab.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/15776041523.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd412fbf6---74582433793.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/jinidemoduseju.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91d56a79e---jidigejadanajoka.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde9e9e066---vupizerujegowafem.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/zaliwipovopapafog.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/98554756940.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/ribuzibik.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/lejufekazu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eu3f9ee19f6b5d8lp6of28s7i2/381536956.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160835266a26f6---liwinekorodetesefupo.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/8024270885.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/loragobefezotevufeve.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/38493469028.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3s8asuiogr7rjq3c2fee9peq3s/fulani.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98552c8f8---jukedolasezilolubadez.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_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 16416 bytes
SHA-256: 69dc6a8cef7a7f67c5b137779dc4f8950e25692cdc37ea60377ee81b5cf3fc9a
font_02_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 10260 bytes
SHA-256: 9eddeaff4429031b845e4f1fef3fada7a8725e304fb92218de2a36dd7e3f3770

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