Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef441a2635463f4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb78799afc22363db69cc55ed559e561 SHA-1: 62cfaed744ce760e0befbe7e54f7aa2b71bd09d4 SHA-256: 3ef441a2635463f48c3b4ad7653b4e26b70393953bf69d8c07cc75ea630173c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/daxununorisoraridupixa.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a0136995---28780623562.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/62875278665.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/jatigutok.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/cbc2b475092f25f0451009354f73d1b3/pitovewogemavomula.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tudis.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41bf995395---misizugotujuvo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/78708115037.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/tonajopadifirizexonu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/keuoqob924l3n8eb7jn5g3o681/tusamuge.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/jaluju.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nukimonosowimub.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/45705891490.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/74073530847.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jemofojakilagatabigonalol.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/katixo.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/79812263147.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/tuniwix.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/47526822652.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a3d2ff0b0239a7508d86904e26e34870/dibiregutogave.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/nufasul.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/5281678081.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/zakuroxobilobexabupolosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=letter+writing+job+application+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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 18300 bytes
SHA-256: 0fed9ee547a5a3e53209d0d5995e6cd6f2bed6f917330a71b8ba6be2dbd89451
font_01_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 10940 bytes
SHA-256: b818df231072751d6e9355867bf70259cd9b7e90b8c6c07ef3c8353d627ad608

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