Malicious PDF — malware analysis report

Static analysis result for SHA-256 04177269bd60de17…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 21:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ea0c83c71af21aa9fee2dc5024fbfc9 SHA-1: 74474248dc9bd7626ed6ba5671dddb16cec36a8f SHA-256: 04177269bd60de17be6135a7cbe2ac8a17a75f0f14f2f37569d49cac68f36008
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/73739929231.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/37441066159.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210810014555.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210625003200081565l53jkn3rl7n7.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/4594898543.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff0ae3b57---56728630050.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rimukudigis.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3a06354f98734ad8bfee5108d5f41079/runikugaseg.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f8329c1c---7924774818.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/wukafak.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/namofudolekagexovakilava.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/basupelal.pdfIn PDF document text
    • https://medtek.vn/storage/file/sufakajat.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de570f29ce---livaxegewerokejonorij.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5468ef0f6---jivasazarujeve.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9904f68fbb74ccde0d4c0b8131e6a1ea/95289622452.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021720652546055.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/20471981371c8345985131535d0e345d/baniko.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/givusopiviwobuximiwates.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/gokavaregedilekifekediw.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/34754023285.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/pezawudosomusife.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f785436---21330896057.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rizure.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/koxukutu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pn09l3eovijnko8fkg39ihurl3/2566102629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=powerful+healing+scriptures+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_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 17104 bytes
SHA-256: 6f25d84b62c23ff6cfb7aebbedf7a37996cdd3937581093637c23a841c455aef
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 11088 bytes
SHA-256: 1dacd010072920269b032e3488b4bfe6a9bb399e92f1328f5b64a22cc0cf445a