Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae5c64851a08688…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 21:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cacfca1fa5d59cd8c66368aaa071af9 SHA-1: 033fe010d9802ed6b4ebbd2d004a124130cf6218 SHA-256: 9ae5c64851a08688ac8224bbead15d225aad753add5bbe84ab8cefe160d3277f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jyapa.com/jhuoyue/uploadfiles/30632769350.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4rbi490l2jkf3jg51lc6sl684j/ruwiwovatelaf.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/makumarowujoxoritow.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/74935216903.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/filumavaliwu.pdfIn PDF document text
    • http://tano-cable.com/d/files/15520473326.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fovelepukubegodominep.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/nanujaxunejoxof.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/58282441102.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210906160216_e8p0at.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/79743938458.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/79840355790.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3ii3icn2tjupi4l9c601o1cc11/88417674335.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/97106431319.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/42290831525.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1jrctaisn83rmhu0noi5lq1prv/gebetizoleroguv.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/siriraxikopirurime.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vawexom.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/sijidivafilari.pdfPDF link annotation
    • http://canadianrockies.info/files/file/28737893232.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910040410.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/fazunorozufomufajigoja.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89ad9225d---38281087829.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/jabugevurotofoxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+launcher+apk+downloadPDF 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10508 bytes
SHA-256: b2b9e054b4f91ad0605e527d36c8eac37fa841619c705be6f8ef5acb5c1aa689
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 18612 bytes
SHA-256: 5cbec764b0d155c735976020f7b95e28c449e3e4867ea7457a0fef65b97189ae

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