Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3d270ca36f1e93…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 15:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a1d76ad17c0fbce2a3547ff3ea02919 SHA-1: 3c4756e78ecac569518c2a05a485f53a269ff82e SHA-256: 1f3d270ca36f1e933de82189d4000c1996e3a1b35e9c1186e540a3648f85dd68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised CMS uploads and disposable domains, suggest a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=motorola+phone+power+button+not+working PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41621d14d---80006328140.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/mosidaruxusigalibumexe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • https://actorconseil.com/files/file/xutunumotif.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/41684452346.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/mabupudunomugakirike.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/76982670520.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/81417700401.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/70050193829.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/15528697717.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/zidatabifox.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nuximuvuruvubosekiz.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f9408060c7407daebd6c6c858e95c063/xasuputobopanipaxosufo.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/sirunewexovulopazow.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jakivimodatanatipidikudum.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e9508ea0---70024764748.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wefumepefivajosobuxojoz.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/49292748724.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/48738456439.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gexokek.pdfIn PDF document text
    • http://blgjad.com/upload/files/51490986929.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/tudaguwifejovujupo.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/jupuvepojodeg.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/nadetotimo.pdfIn 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_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 10776 bytes
SHA-256: 30126a753ccea61aeab99d2aade22bad512cc054e9d815ffc469d687319367c6
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 17960 bytes
SHA-256: 54d11554d07a58850a2036f36e47a5dfead1a14cec1ded36834b6428560a1006
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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