Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ef57e5f4fb8e95…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 00:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1860d8064e91562d88b229dfd9331080 SHA-1: 49573da6c1c03b8682e07415f6545a2301a18880 SHA-256: a9ef57e5f4fb8e959c49db1659d0ba9df1e96e712a88fa6987d02358aa64b2d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are designed to lure users to external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://devcons.org/uploads/userfiles/files/mojojuxu.pdf In PDF document text
    • https://forumsevens.com/images/file/95267825717.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf999afa9---noxuvonodare.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9624d038ee02f2759af6eb9918d5b6d/25287506875.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/58062860511.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149dab921556---pedobipamelipuw.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/30801052744.pdfIn PDF document text
    • https://agrando.cz/files/file/rigadeju.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/54201554121.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/63121778669.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/46133881035.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xijemekunoded.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/tufivubovenelojubikog.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vazinadigofarogir.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sotogixofo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4hvhdhncbac7femocf3a1rgedj/mesuditixifum.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/46217936538.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/20046007369.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/kumupafogulosili.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65675419865.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/68048153332.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/57326017860.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/46800914507.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/69454913393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=something+about+you+makes+me+feel+like+a+dangerous+womanPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 18620 bytes
SHA-256: 18121f4a42868da6fc8a67b7827e9f69a7166976a5ee747e5735a97c8561bb6c
font_02_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 11408 bytes
SHA-256: 5062a43d700726adc951c1252641a870845bb92f3f4bb7f79bdd72f6a279eb37

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