Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4d62b8592e2989…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 20:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fdcb142c87cf4ac3978f5e2e7994b88 SHA-1: f275fd3207d9fb24e8ee1f46a6fb60ff4ca91200 SHA-256: 9c4d62b8592e29899a82dba77b076e9dfe97368f6bd33ad58b65b4d0aa4306cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or redirect users to phishing sites. The presence of external URIs and link farm heuristics suggests an attempt to lure users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://oniceh.ru/uplcv?utm_term=nokia+lumia+730+android+install PDF link annotation
    • http://indianspringhomes.com/userfiles/files/jatalowobuririw.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/tovisipunafowataviluzisur.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/81819715034.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/98151839185.pdfIn PDF document text
    • http://01host.ru/userfiles/files/61792770370.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e93313f53---wotezulibadarobotoxete.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/pugifipufofimoje.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f937cca3001ca1d9482f1440e7e1c464/77429563468.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/15bf88b90ba6acaaaa64fab7e337d8b0/suguwalubisinikeb.pdfIn PDF document text
    • http://preiss.at/upload_files/files/givake.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d7a076e081ac1198ebd85ed43b51c3da/lugelulotasolofu.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/10937310903.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/vugixiles.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/xanunipaderunidumad.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/20404908933.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wurabawogavewenufusuxaf.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/72806486238.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/59136714648.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/50188282106.pdfIn PDF document text
    • http://muszempilla.com/files/file/giloxalumaponuvi.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/50272505063.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/76827941025.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/62466319931.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/wakirakebavin.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vhgb39libd8rb1a82ptih247s4/jumizoxaluxokasikitogorek.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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 10792 bytes
SHA-256: fc5282d46904c828915dae69bc5527bf99abecffabaf89d536a8aaf6fab8865f
font_01_sfnt_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 18716 bytes
SHA-256: 363ccc952483b9b87ba95234e9ee9035258b459e3e0598ad859ffbb474bd114b