Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dba4d63211765d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea4618ecd79c7f465bfd1b7783bb2089 SHA-1: 990b7c0049149cf0dce8f321c0862a2db8472980 SHA-256: 75dba4d63211765da832d23db208f695fa230eafa04581ba55bb7b7e870fa566
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript likely serves to further obfuscate the malicious intent or to directly execute a payload, while the link farm aims to distribute the malicious PDF or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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 http://schokobrunnen.com/idata/52984910850.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3969c0a834619a4ba54ce4a55a6d50b3/gigazi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riwugijuxaxobu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pmaq6j94vmrile74hba9fkj773/68043804049.pdfIn PDF document text
    • https://koratspring.com/upload/file/59693255987.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r5h01dilhg7brfq95cg9644ptv/gomumalulofejerokibaga.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/81598156786.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/95673474304.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b94a2cf33d7---42634898256.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9337c450793c1dd00b7a81e6bac198cf/76087675195.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c4b86ac2f---2377696288.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53564315619.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e6b96021---68471213426.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a16f2fa29---kifoninavejuxirowaf.pdfIn PDF document text
    • https://laps.pl/userfiles/file/47444393791.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105857451efd---luwikewuxag.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/94997029070.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/latuxidiba.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504183534173097.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/lunidubasorenubobo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d230bc5c3010a21ee224b76f81524dd5/28992615978.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b5e5e71e---soxokaja.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/31033875096.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/49370601440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=completing+perfect+squarePDF 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 11100 bytes
SHA-256: 2a0406e8468f40c1076559abe98f4dc14122fcdb4eb00de05c772a35e348379a
font_02_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17044 bytes
SHA-256: eaa1b8629215a52dd280fd493372cf0e3f0bad1cf5420df013568181cff58928

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