Malicious PDF — malware analysis report

Static analysis result for SHA-256 6644af32e0ed2acf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 13:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b261c6cc4f26b0b008194c546930bf61 SHA-1: 39d9cd35ad7fcfe76e90b60bd265aa925613edcf SHA-256: 6644af32e0ed2acf7c8d0ec263fd5f35bcc867a409ee5c2a3e8236b63965d7e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc45c2b67a---woropelubizere.pdf In PDF document text
    • http://bhhangkhong.com/upload/images/files/80082787394.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4aaa4396---jonibokisuwuzanudaxetud.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wupuritekod.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ejbkk4vcnegnmm4j9gnaijmeoo/60548861350.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/33034189359.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/32997547669.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3ed2e33a71cfea5ae2a60b5130fce103/pepunurimol.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/38085633153.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3071e8918---fupalogorezofufenot.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/nediwezoral.pdfIn PDF document text
    • http://servmed.net/userfiles/file/nijavi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe27edc3f0---15180419440.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83074611439.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e38f5c6b23b6b335b46df8bc70469a2e/14247844052.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/55886166944.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021061716104210.pdfIn PDF document text
    • https://davaocarrental.com/images/file/mirepoger.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a305226a1---92262878645.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5b60ddd17025f36d8b864c0b5128b69a/71369748469.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16858100162.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4491224---62265405391.pdfIn PDF document text
    • http://epplast.com/files/file/80977697259.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40fc22c157333aab7944ba331c159631/84726859755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=banalidad+del+mal+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_off0000bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 18896 bytes
SHA-256: 2abb39f95be43faff89cd7dd5bd81cf1fe2753bc9175e8e3cf408389fdbba3eb
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10228 bytes
SHA-256: 85aecf11d43ca34adb00f7d2e6fc9eb395f37ef98cfc0b19ae34db8785e38646