Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4b394220ff8c34…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 18:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a64dd825f25adf2e91ff5e6adcc69e5e SHA-1: 9d71b48d5db327b190b6ae4889f71c6bd62bc478 SHA-256: 8a4b394220ff8c343aa2bc0a52394e0a116c36068457b470e9c41a60c6195c46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories and disposable domains. These links likely serve as a lure to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://thegoshow.net/userfiles/file/simabafe.pdf In PDF document text
    • http://lpc2529.com/piceditor/file/54088572987.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926f760a0b5---65384429446.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vafijovogawavituku.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/82405943821.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853dfdec66---1570593115.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2cfd31a0---xabobavovonigusol.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/lamufokosira.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210720_B6D90B26C0DA27B2.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37987ea253---gorirubetaguvaboxusuda.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/2097993406.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mma35s44srec32upmecmp8h9rb/titokerejegej.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/lajemetunanav.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/npcgelcnb3gsvmqcao2ob6m2gk/dakebelisojoxigiferawit.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de77565dffc---poguva.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/57371272823.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/79840723760.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/93454405814.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092be0aa83d9---jupamelagi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/sadidewixovij.pdfIn PDF document text
    • http://temple.mo/userfiles/file/87835630244.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/55018259779.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/35301183839.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/puzisabivok.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/s0qq1d9puhga5prgdtod45f544/17123746499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manga+achar+recipe+pdfPDF 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_off0000b2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FE 14856 bytes
SHA-256: 3f1ae385d96c37047841ae0c91a441e600978e0fcd4b792a4c0483b6f63ff10b
font_01_sfnt_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 10460 bytes
SHA-256: 5dee3530ca5338b4617c90394c46e5e9d2000cddf5df8882c3466f3ecdf49fdf
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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