Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ce131bb88b7e2…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 09:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b3cbd791f34f219a0e6ff9d83da2aba SHA-1: 48b11ac29bea926df95caf9edfe3a1b92c1f586c SHA-256: a85ce131bb88b7e201e5d699b84f0d76a78593a8d011e02edf7092328a746cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and a link farm pattern points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://profm.hu/files/file/liwoxogarivatulijugekubu.pdf In PDF document text
    • http://atletika-pardubice.cz/files/file/18232856138.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161486e9ee7d30---bodovir.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/2191790441.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614c100f7da3f---91862339789.pdfIn PDF document text
    • http://agavietnam.com/img/files/16817363049.pdfIn PDF document text
    • https://22importexport.com/eimages/file/23737077154.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/xirifupigopinojogolawu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/33825641767.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210928030821.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/21439030586.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0bo3r91u6sngu72fpntareri9v/7311247647.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/d222375261a3efc0965833f139822dc9.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/52521141856.pdfIn PDF document text
    • http://domosplast.hu/files/file/89250047667.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/bevodidazobozo.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kipirumafexobivuwi.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/92440663505.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614de2918a706---tizifadupivutigoxa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614f28b6bacb7---25179202682.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nesozebazejefivofa.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903054236.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sezanaledopexedima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=low+bp+and+high+heart+rate+causesPDF 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_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 11028 bytes
SHA-256: 1359f55d2832b4a26f119fba37a0f822966dce517b0112a124f767c84ebf36b4
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 17704 bytes
SHA-256: 248303f63ada135438eb4e6ee23010ddca739ecfb67cabec90039e19ae5a8977
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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