Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb7fa194b3dbf2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 16:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb703a728a86a891170e31d1fc835126 SHA-1: 7075c2ca49c0f7e0b147df9ede5f3f3e0715bf0d SHA-256: 9fcb7fa194b3dbf2b18b1a632de3e85e9140c4522616b14702fa5bcc1d734828
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=search+on+instagram+without+account PDF link annotation
    • http://sireny.net/share/files/84595027725.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/34924704631.pdfIn PDF document text
    • http://watch62.ru/files/files/29586379112.pdfIn PDF document text
    • https://akconta.com/uploads/files/daruwapejosibegimabupa.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tarevasawejalirazuru.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/16835119721.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbd2b5987---wadozowetakapozita.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/kirebinimaziv.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133426941f93---42956886008.pdfIn PDF document text
    • http://mp-journal.com/media/file/72127997833.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/8056210355.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/fudojidegulagimawamef.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909024916479.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/21941066644.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b914a24b28---xadaxa.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tigori.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774ff7c988---lebakunabosopat.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/ziviworibovonekumej.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/bupirewatepana.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/49184585192.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/78774086794.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7f5ea6f33---5683155389.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/33183807709.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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 17596 bytes
SHA-256: 81f6fda968f6981b114a6b1d632297fc4e810625381bcd122694846ec4adc29f
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10892 bytes
SHA-256: cd87fb5670d8664dc1f5df8df04ec2d4aa7899aaa07453c5f2329fd9fc4808b1

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