Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d470fc039ca892…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 06:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 671bf95db1fdafda2b482346a3124134 SHA-1: 14e9836adaf9d4204a3b441d8f234538c5ec1d58 SHA-256: b9d470fc039ca8929486dcb58812ad0be3b0dc570fb27ef116444882bb18f9f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the presence of external links and the password archive lure strongly suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=create+zip+file+android PDF link annotation
    • http://www.julietlandau.com/fckeditor/userfiles/file/pewafunasegu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/32793650722.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49736313024.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/44685230992.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/voxajowogudanepudaf.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/fokelugiduxabigizideb.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tojojuwodimozokor.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/lefutiwasop.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/rupaxabujodixunatek.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/malumiwezitefise.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/zofovozag.pdfIn PDF document text
    • https://led7.ru/file/wukulurijifekuxabed.pdfIn PDF document text
    • https://tonitomov.com/picture/file/puzojetexizuv.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/xitafefumegoxokifixapepe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614900857391b---loboxijojoworebave.pdfIn PDF document text
    • http://generaldistco.com/images/file/ruwofan.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/10635226369.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131385b02b55---jepomupipadipi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f088bd95be---kekusuwukezolikoniva.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/losetedujiwerigetanavobu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/puralevuwurutaso.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/9314483294.pdfIn PDF document text
    • http://acelybio.com/upload/files/xedavasibigusupotoj.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/50042945348.pdfIn PDF document text
    • https://kar360.com/resimler/files/lopasuvigunonuwapukegal.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c6d5db81---5844607672.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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10412 bytes
SHA-256: 8e95e314ddc93844727ec2b673b6ec82a187eabbcc828e31ba3df86cf8afe1e1
font_02_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 17440 bytes
SHA-256: 36120fcdfa44fa54c2acd652d1402e4bf7474c873c04ccec8c8edadde6005e40

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