Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67b40bf54327507…

MALICIOUS

PDF

76.8 KB Created: 2021-08-16 11:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaef1f7baaa67b74aa398315dcf3ea32 SHA-1: 0fd1872ce76418b39490b1ebf341f35876958bef SHA-256: f67b40bf543275074a528e1c3a0729f7c30e805893d4fc808c39b5b0a51b0e27
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to the download and execution of further malicious payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://pixomot.ru/uplcv?utm_term=seance+d%27entrainement+foot+u13 PDF link annotation
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/983b186feed90334a8cf9bfbdd1abe52/rawutugobozovalulu.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/xuribabilumomo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfbdbbdaf---molinumomoxurigoli.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/pediseboxisuxola.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/juwupuwuxofikexasura.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/82074841523.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844671d501a---tuwetovenivogo.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/moginiduzet.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/98803655248.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kinopoxagepidapalorizo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487999d2e---wofodotazoximexadoz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611018f4f1d8a---49854225472.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/62613760001.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2o01rq73jsongbr4srcub15juc/dowegodelume.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a813d4a3fb2---34031431195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b15c822f7---femisuwuvenik.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/tisoxuwaxurubegivutobal.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/suniromutiwubapizudigux.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/73bb84034e8bd1545778c413784f0fbc/topisabezesojegexi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/25578899598.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c53149dcdd9c4eb3b440240a70bd9e9e/95787008056.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/p0ek02o6up51run98c39h9lrd0/40338274750.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f8a72e797---vopitevaw.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/wonisufutusemaputaduzuw.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/11415111601.pdfIn PDF document text
    • http://www.leducafoot.fr/exercices/u12-u13In PDF document text
    • 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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 10856 bytes
SHA-256: e2adaa9dbf4e1d93ad54b1122369120c08a3bd6dee8abadedd366800365d828a
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 17264 bytes
SHA-256: f328bd1611ea6d26c6ca25fe94b8fa20824da5c4da0cda3295fad9a2b8e4d3b9