Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b08a22fcfab4f7…

MALICIOUS

PDF

68.2 KB Created: 2021-09-11 06:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56b9fa8f238155ede902d9b5753a0a70 SHA-1: bcf56d44fa02f02bfc62ed09f0ccc6f1e87052f5 SHA-256: 08b08a22fcfab4f7dd2607343be11df238b663bffd7bcd7daeaa8fc8ac917bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload storage and disposable hosting. The primary function appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=pic+collage+maker+download PDF link annotation
    • http://hoclaixebinhthuan.com/upload/contentFile/file/21399276570.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nisegajaxegefujugulew.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/momidovoverubogepod.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/supigerovifigomar.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6aptuj6ttcgburorfa2ojldh3/genofunizureka.pdfIn PDF document text
    • https://energooptima.hu/upload/File/65046101716.pdfIn PDF document text
    • http://health-bridge.in/upload/file/44257783908.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/juxunivawo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/48576388838.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e46e9f67874f43415bf0361c184fe45/pemodejigisuluwazoga.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/54162755730.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad96458837f1fb9f7f868e9ec821c3db/49444589909.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/1669569598.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/60603008690.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/patutudedix.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa23f156e---tefutaxowovug.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/juragumutidekuvalokefex.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/mapijividubekudoduluw.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/nupujarolizisad.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/famutetalop.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c84d0c420---11984152620.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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 10628 bytes
SHA-256: f4f98664cd53818412e2851314c8179e40135398445803922d4cec4b3e50a9b6
font_02_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 14652 bytes
SHA-256: 6778f55c0ea306814584f57d21f9643860d5e843050defbdef42fa331c1f3a49