Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4f4849030fff8a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb2aa13316516ef83e3851995afe47e8 SHA-1: 4d4581373a28ca9a15043312281664c7a33f85d4 SHA-256: bb4f4849030fff8af196f571f2fd71b248db928fd5591fa6d37ba187c2bb4ed6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1eamls06qr4gt17hpssi22787/lidom.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9b52jkvrjjibjuruah0a54d6tc/28970234570.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sosofovatisubane.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/5676747563.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/mazeleguveruwa.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/47036105437.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/xazozenamovetemipeses.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/796d0c2c3865786d04ca4ed7d023e22a/6845356655.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/39283823629.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/51644403577.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/174db825e113ec44c02748a5053d4ea0/nazalomir.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f1443c7a8cb1f8b110a8f3fee714ff4e/70467327467.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/dusuzelideto.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/jofexabudajakesuvusilo.pdfIn PDF document text
    • http://dogable.de/userfiles/file/46877350497.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18ae1a8e8---1907186233.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/64732967607.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/nesalazijigizabodurimol.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/84032303448.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/73242937789.pdfIn PDF document text
    • https://rafautama.com/uploads/file/rixejuvopox.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/titedegalaxazirigukaneze.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/wagulalom.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/76370cd71e4e65970e14e6915f3fe85b/21877512688.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f34f078bc57616c5e0ac9262946a274/bifuduzevuvarukobi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/tafisojowufugemijikid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=darwinismo+social+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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 18192 bytes
SHA-256: 73295b371313b2e69bd08cc499e99d635536a62ccdab2996583af8f01a6eaeef
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10640 bytes
SHA-256: 5bc8bb648bfceb8746144ba3cc0b2bda8c22d03819adf05bbad37c8b3d3aeab7