Malicious PDF — malware analysis report

Static analysis result for SHA-256 919ee9ef8aa5ca2e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 20:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3eb07352f287cb7174482bff6f0e8011 SHA-1: 43917a5f2016145db2a3988971a4827c24daedfb SHA-256: 919ee9ef8aa5ca2ec8e83a447f700f2a0617dcc113a5e01f77ff19efa8331f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=aplikasi+edit+video+call+palsu PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161373a5d21fec---xodegumutakejudok.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/88606253314.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tumarepinowakelasiwikut.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d9ea0b817e41acd3d9eeaedb3f72408b/sareja.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0c49f2d6---21468957706.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109090409163456.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/30607368776.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/movirofujugugiko.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/zupem.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c59e1d2a---taxazisajuxapepezu.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/boxevij.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/844560499.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/rudovifobufo.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69725075094.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/15259325852.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/15068756707.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109160815502139.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/fozojodipugowelepigexudew.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/puzub.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/rilamifevavejefip.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/wakozulanowoli.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/walumuzazuj.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cksetrtu48an412s367ddu9fbo/wukik.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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 17424 bytes
SHA-256: 71708461a81ef0bc328035e43c29f3fb1f6633293429606fd96b4695cdeb19c0
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10544 bytes
SHA-256: 8447f77d65f0f245863c04da277493d12baa59bb03d764c683088128caab6bb8

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