Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa81fca0ab009848…

MALICIOUS

PDF

82.1 KB Created: 2021-08-14 22:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bf4cadac40db77d460f6912f410438eb SHA-1: 014a803d9e3805eabaebb2bd2cc499bc135715eb SHA-256: aa81fca0ab0098483fafd9291da3b50bac3cc5d51f904069f83f1fb4b95be847
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, pointing to multiple URLs hosted on potentially compromised or disposable domains. These links likely serve as redirects to phishing sites or further malware downloaders, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://paillasse.hu/userfiles/file/14490605023.pdf In PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/72120044419.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/8873646852.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92a1f33f4---lufujujamofa.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210731_094409.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/12848006562.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/57656773798.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/31357128244.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/89361029093.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/j4vn56ot6qcarvegbmil5isdhv/86759765.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/zuperavusepupuxobix.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160724ce7d7f69---46452422112.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d46e7a07b08---nokogo.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zewuzubupu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/33455614706.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bc349541d402e642b14b7e8ca536e347/leseturotugokivazide.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bejixadedixeba.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c502d38ec35c0bb7456ca47bb885aed2/vakalapevugapigosutelop.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/74548240938.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/27379251561.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210728120144_amp1wj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab971ce457---wevazobokakinopado.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9847a0ef1---40252732684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+lowrance+depth+finderPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16984 bytes
SHA-256: 09caff0d74c4f7ad62fcfc4bb03f3ca5089a4b5d6942a05b34b332611cc056aa
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 10892 bytes
SHA-256: af15a6b8732169dd80c2c1bd3d53852c7172947b18914b274c1b81329a06349e
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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