Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d88776106aab19e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 19:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70ae0f01c2f31a7ab53f02b06c8567f8 SHA-1: 9b523a93695444455b25a6a45905d8f2f238ccf1 SHA-256: 3d88776106aab19e980b9d13d3d1bcc8003902a8f2bd46e2e18afaeb435f88fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that form a link farm, many of which point to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=eenadu+online+newspaper+pdf PDF link annotation
    • https://laptoptranganh.com/data/dulieu/files/35919976554.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pixiforovobato.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6d23b14e4aaed3554c6e0dbd3f101522/womowalalabiradu.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/zibunutogexurosivix.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/11585665877.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e042275---22565070446.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/dixudusoluxuzixegotuf.pdfIn PDF document text
    • https://raljob.com/userfiles/file/wixaxifax.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/famipufexofuluketa.pdfIn PDF document text
    • http://selidbe-beograd.info/files/61512823916.pdfIn PDF document text
    • http://www.heksan.com.pl/file/17472215057.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d33614b9---verozegi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/fuvefekimogosawet.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cilp6gapoi2tioualhmjm0esq0/22575028299.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/nalorimozamuziwegovaw.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/32846343042.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/63177937035.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d79780ecf---vesejuw.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/wafusufasok.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138387e9605e---11466399930.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rekanatogejezewenisoji.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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 10564 bytes
SHA-256: f72208b8450a7a3fce6f813935c0ebfb192b58c9a8a95eaaef1b373718f178fa
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 20156 bytes
SHA-256: 3f73694b6f16eba79c1dbcf2afe890f62797139db0a119e79b035fc7e76f26f4
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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