Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e5c40c1de22b65…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 10:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02fa95a31b8a0fcefe380a0239894c0b SHA-1: 82dbcdb2437ba40aa4e7c18361e6da6c68c39078 SHA-256: d1e5c40c1de22b6501238d67441350f0d93025c119f676747f91f666ccf237d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ddtoyz.com/ckfinder/userfiles/files/69389181544.pdf In PDF document text
    • http://uptownchantilly.com/uploads/files/80611254688.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nenibavilepurolowomatiwor.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/74400987841.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/44229681411.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vikoxudufupolapakutubo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd32da00d8---46108060536.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/kijofijefotatepowas.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16447387306.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/togeda.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/db277c01c0308eac1542c1b3bf283db0/sefomajefesus.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9854a544---fazuvudewofimagajebiko.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/xeroruwexiv.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/nofadexokijolo.pdfIn PDF document text
    • http://simoncaulkin.com/images/5466002799.pdfIn PDF document text
    • https://foulardfotografando.it/file/mepot.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/27916953070.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1a15a4e0d9eaa512808afed5da737feb/8410797669.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/18493908026.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f3626d9c872607b68e1c2473d7ef03b1/sumezoxowivaziluxusez.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/221baa93862e88166e5e24acb3ead93d/88672462967.pdfIn PDF document text
    • http://bdnchem.com/upload/files/nemarotugezogiruvelig.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/tk4i260jm5f4p863hkj9hq0tik/350751475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+lumber+room+theme+and+analysisPDF 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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 15852 bytes
SHA-256: 631319aac0fa095d30163ccb647551e8bcbc88d4b443554708831aa18095b196
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10832 bytes
SHA-256: ea9731276b62975b0ac8cb6873443283fc55f757b59ff6b9666f4a12624e7770

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