Malicious PDF — malware analysis report

Static analysis result for SHA-256 8461ab6275041007…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 01:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 142b517674f0fb0d7e5c615d513bc023 SHA-1: 79ef3fb1502b63299000a44f4dd4f9c0d1394122 SHA-256: 8461ab6275041007fffb7703e221d0d564dcd858da8ad7fc57704a4cd4bd84d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting indicates a phishing or malware distribution attempt. The primary goal appears to be directing users to download malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed3c4eaa95930e935ce672df0baec0f1/vekiludasum.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161348e95b16f2---mowuxutulo.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/kujokazagixofok.pdfIn PDF document text
    • http://matras-devison.com/upload/file/26718747444.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fumewejupowiwawox.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/nuvusejewir.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/voxazawomusemotivobogero.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/milewamuwewipujamet.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/3903334644.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/53758297774.pdfIn PDF document text
    • https://netlandschool.cl/files/jewepon.pdfIn PDF document text
    • https://arendic.cl/files/83935558733.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/36700088825.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/xegakifu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ce844cd6---43126104971.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/82679328709.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/88173428386.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/85034712434.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/suwos.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f575196---72990266842.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oj39i7q3nmqhq3nso2mf1us6ec/5071047695.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/lumoneja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+chrome+for+laptop+windows+10PDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 17724 bytes
SHA-256: 1bf8662e890e17ce2714993dbc17650fe7e0efc335241215cd8bdf2eb870d9e5
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 11144 bytes
SHA-256: 3cee9c56c5069dfb337c5c12f66a648d31c28f5494f031deb45fcd0b722eb7be

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