Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cae554623083bf…

MALICIOUS

PDF

87.5 KB Created: 2021-08-21 02:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2126393d4d3b1a998e2801e715f58753 SHA-1: f9aff1903b61814a8e4079812b71bf28a2780973 SHA-256: e2cae554623083bfdc927d4a4eaa2dcd30922e795f4f8f93771bf483f1af4a1c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely contains instructions to open a password-protected archive, a common tactic to bypass gateway security. Numerous URLs pointing to potentially compromised WordPress sites and disposable hosting were extracted, suggesting a link farm used for distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://eyescare.vn/app/webroot/upload/ckfinder/files/53198602860.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160e058763fc15---fipejedupulibufog.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/98179412046.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bokanuzofu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081395f91758---30968479163.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/20792576461.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/95625321025.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/66641572825.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bd9ea0b5c02f4e0e882c76b9a7a3ce38/nojetosegafoxemupisu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210808114115024.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da5cb0c49---zikuv.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a326b4c1840---dowexe.pdfIn PDF document text
    • http://kfbi.ru/content/file/tanitukupuwagokakimixarow.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44875d4d88---4618916048.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff493e079---daguwifepobifap.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/33580931360.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c72e46aba94---2428145345.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/mosezo.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/56997509363.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/18636055105.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120411c2ab75---nerokepemuzexuwifu.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/76484231039.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/18153368375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=www+eps+sanitas+com+de+virtual+registroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 17400 bytes
SHA-256: ebd63ec52f16142926dbbfe9496480d739bcf7cdb3701afc271c4d0c433b1625
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 17004 bytes
SHA-256: 31bf52e8c81f76ec85c7c4c4a63d881238487507ae5c2530cdc4f84a128c2d24
font_03_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 11104 bytes
SHA-256: 1d2d82ff55c092207160d088323bf9c20fed6948b49cd2901be1d2395cb4ad9f

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