Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d2b021cd06390d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 23:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75408b5a7672aae17b2f204d2c4e5aae SHA-1: 315ec9c4f880ff2e76cec2a97e23f9759e85dfa7 SHA-256: 84d2b021cd06390dd9f02f1537686de7245e37d2f8d905408197f14e542c7499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that form a link farm, directing users to various domains, some of which appear to be compromised CMS uploads. The primary attack pattern involves luring users to click these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://philabc.ru/uplcv?utm_term=highschool+of+the+dead+free+stream PDF link annotation
    • https://szabolcsipeter.com/userfiles/file/bavanosopikawevumup.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/92110925442.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/72580060567.pdfIn PDF document text
    • http://findusafranchise.com/files/files/jujativulilupuxixo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/38227125547.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/10761178272.pdfIn PDF document text
    • http://grupophi.es/uploads/files/3778993027.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/vupewusomul.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/97292757460.pdfIn PDF document text
    • http://tecksco.com/upload/files/tilivulavuzefirusiva.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459911e165a---73020287073.pdfIn PDF document text
    • https://norservis.com/files/files/12840170879.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce2fa0202---sadafikinapob.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebipororu.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/noretire.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/melowiseridexupomelazodo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/lijisoviw.pdfIn PDF document text
    • https://ccskin.com/geektic/files/fapusirupator.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/79162993674.pdfIn PDF document text
    • http://jump360.co/upload/files/20210914082844.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sulimexezogatuz.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/82530452977.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86241584239.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7756d1d7---riluw.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/52176453450.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4d7a15002f5766544eb32327ec8a6ac1/35116605382.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_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10808 bytes
SHA-256: d2a9110c58468385a099ea0e5c1c06a767b0685aeda50fcdfbb0a111f3878b01
font_02_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 17576 bytes
SHA-256: 3840439cd4d2923dd6428e3efcf1c3cff9131f16854d21bee1ec638b94455af6

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