Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bc844ceb3b654b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 03:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d624cddad8a04490de002b8b9ce1b12 SHA-1: 90ed83ad53f11f6fa67d3c5ea1fdd5da0c7b15ac SHA-256: 00bc844ceb3b654bf466b513d862c150428f3c1b8926c9884faff4045a60a787
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://amidoux-peintures.com/ckfinder/userfiles/files/kibajujilesanapuzopar.pdf In PDF document text
    • https://aronabritcan.com/userfiles/file/98084302180.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05bf38316---dikezikulox.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3be2420e---44758134409.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/13017111463.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083129db822a---86705837428.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/68727021038.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/pubumagurixavuguvedal.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8793a2f3cf5f41e17346c4d97b469db2/97400837708.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/diluvunovimukewolirodoka.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-5/20210605152335683453.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kakozoxazupamemowuka.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/rakozunutali.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fcbbec52---folajajoxurivaxabeb.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ir0igcfk8ahmv70p4duduhf6g5/62236171351.pdfIn PDF document text
    • http://ropesadventure.com/d/files/94191437489.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fovuxiwamugox.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/verimakubifif.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8a633831c3853f0404bd5e532ac6eb1e/5843012306.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/wasuf.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/74016d3ad827933935bae661c198bfcc/88424175428.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/45c704fad0cfd0333d05e296846eb31e/fubodovowuvebunasudi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1666327a6---soruzopi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/88e9148f684ccd2688496ac992f92a9b/varevuv.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/55030179110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=molality+practice+problems+with+answersPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 18476 bytes
SHA-256: c4fb40b683d9a3ece7ce0a8d5f398ae8ea7c8da8011fa71c557a2d6875b6e115
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10972 bytes
SHA-256: cf0e93e0832fc28cd15ef11431cdde38019e22fe1833eb2bac072572fd55d0b9
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1