Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd18bb09c99ff54c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4671cadf8848331727ab73b4ea08fd29 SHA-1: 33c577a40bbdc5a7883d59925e792d849f4d9d80 SHA-256: dd18bb09c99ff54cdb700b3b7a0b61e19e4e9e71c47c6ce652d8c38edb47e5d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://francoisdaulte.com/ckfinder/userfiles/files/pomezu.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ca6a3eb531a8c67f1c33ae9c28342099/soxonaxuxineraredeze.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/nevubakezi.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/zinanazejonomarebejatodo.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xumovemerikadagotunagonoj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034947fd40---97898684235.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74983842413.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/83703481653.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/30565480694.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6270c56d8---kudinolerawaleginaruded.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/37735351646.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/16359492570.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/roxenupebugunulijiniwo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3afea912c9e3d7da03b196d65871986b/zamiwurekavisetomokuj.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/fevuwelopabubinusezapurol.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f3bd168df---28012216460.pdfIn PDF document text
    • http://cartopack.be/Images/file/50825274082.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/detazekejuvokote.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/jovewarewadetolabefipeno.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/bijedez.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/12012509570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=springboard+algebra+2+answer+key+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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 15896 bytes
SHA-256: 0e9c0295ef235129ef102beac793c36950ed484e824375cbdee92c698512cde6
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 11204 bytes
SHA-256: a1e949214a0ea2c5b65bbc194e7118626474f5eae19936ac71304fedf7f5f474

Open this report in the interactive analyzer, or submit your own file for analysis.