Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd8533769c6e18b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 511e18d8e9d5650c313cb328a4e97d1e SHA-1: 04ad2b007c906baaff9d022ca372d3078aee50bb SHA-256: 5cd8533769c6e18b04a059aed2e6196233909f661092fa12c0f4b86d0fb90db1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://mercuresamuichaweng.com/admin/file/nidakewobulisibako.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160859c521c050---bujitofuse.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1873feb1c74efd9cdeee8a5d0ce4eb17/pirujuzenuwijowowi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb92e335ae---sezuziwojiminaleze.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051920033117.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8e3haq5v3irft4ngig2gpdab80/saxitupeb.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093648e52a9b---tolinewovugunukanafusoben.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/peduduposewobozi.pdfIn PDF document text
    • http://psfund.org/public/uploads/files/cms_files/99421111828.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/topupipud.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3b29b2be14f37c5bf8e481eb4b18e8f5/79118677663.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bac069dc1ff---tamumepuvirosidubisi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/js6ilg6fol8rcd0j9pdpn25bf6/65326905559.pdfIn PDF document text
    • http://gdaniec.com/upload/files/jafejesodulum.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liwesanofamegobuvebekoda.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/63625663089.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/zorotudijarerutadezepiv.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/b3f8be4a47e59dbfe1c1aeea35229330/90749764329.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/sipobujokidixime.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8736fea9297a6a51d4212bdd8d49d10d/98567976424.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/2145071022.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6b0603795---32290503886.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adb303d8a0d---73368657584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+far+side+gallery+4+pdfPDF 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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 17796 bytes
SHA-256: 9ffa3db6ece0a61a3e031f6eff23d4ba0da5f08df3142489218597de6afceac0
font_02_sfnt_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 10612 bytes
SHA-256: 541df7a6ff2a6535a4f9396af489a27f6682a354081e34d41e1e6a9b37971f7c