Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a162063e592e5c…

MALICIOUS

PDF

59.0 KB Created: 2021-09-09 14:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96b9c7046190beb7b408bdba5f517c11 SHA-1: b3a771e4d55c4fb02a5090f1573c71ff4d6d4c18 SHA-256: 27a162063e592e5c7bdb278a93a96a6351f2d8b08f59a4b46b60820b02ac57ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=best+android+keyboard+2021 PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2581fb19065c8099cc861687c73972c1/tagetinorinuleleda.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/wenitoleve.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/worabaxevumosa.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/87113138172.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/75433449111.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/munawo.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/11745888186.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/zenuvalopis.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zepibekojegu.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/41222274233.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r69bbqh6ketth398dbepktqd71/detavugurigitokotef.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210908_4F44ADF990EB7361.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba50a509b---xedonu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161301bc8e9f2c---tesofamisamifipanewerak.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9d6bf80---95343327403.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/doxafamopitatu.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/loponuba.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/vodudo.pdfIn PDF document text
    • http://gespk.com/userfiles/file/miwixuteze.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38270239978.pdfIn PDF document text
    • https://hssanesteban.cl/files/datinakutagozuxotonefed.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/78470113179.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/23191814420.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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