Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbb2fabe47e60e9…

MALICIOUS

PDF

85.8 KB Created: 2021-08-17 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e4ca7355f7d8b31d310fee199cc61c69 SHA-1: c109b7f2ffd0ff93edcb6bbe9dc81fc0280faf95 SHA-256: 5fbb2fabe47e60e9bbdb04ee31beb1f3fb3783eaa55515a7fdf60a5ec3db64c2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised CMS upload directories, suggesting an attempt to host and distribute further malicious content. The ML classifier strongly indicates maliciousness, and the combination of these factors points to a sophisticated phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6fb660dd1---surumefa.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d72405d90301d5f715f4726f7a38287/67870482690.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc047c8ec---xaluvutemaropagipepaw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5197c2b137---mivuxenojetumapi.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/61018107915.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/maxebano.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vomorodadebavofu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/60422768979.pdfIn PDF document text
    • https://medtek.vn/storage/file/lutiberefi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7f41923934e349fec8b324ef347293c0/24199436430.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/97628657243.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kefesonabexev.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/mumosirofevo.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/94023934194.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/napaxonibisusurotufolesev.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c5cc8e1510a645467181a32e877a7d8d/75049309660.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16102ff8a5e91a---pujizifixakakugozufepafez.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/6118123082.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/kerozomamurasupoteb.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kinerikalutonopobedojubat.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/panigalobasuliligujedus.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23f80a0cf---tifamajovijiwodasibufi.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/20767898038.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/93893513663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+fix+a+busted+subwooferPDF 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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16256 bytes
SHA-256: 266f7eaf38dd3dfcd7e0868ce571ddc8752bb199b47767e4f6f305189c21ef6e
font_02_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 10616 bytes
SHA-256: 11c90656b727e1186b05f5397839e8704076ec9697f7cf9967ffcbe20825e4a0