Malicious PDF — malware analysis report

Static analysis result for SHA-256 64434efd5a71b9e3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 12:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c38510e1b6a106906bc4807c83a0a98 SHA-1: 40c51b55aa80bc121ff1d581408f543e8f359180 SHA-256: 64434efd5a71b9e39a48cb6410c79581972e12be338d660b044a7c86a1983a03
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing and trojan activity. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/49c32k3l8362fflbciouhem872/budowitofozezuv.pdf In PDF document text
    • http://sam-global.info/files/file/84335403448.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/10074822697.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084219121009---58115259312.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90173c0372---jebokididakudavor.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab995027---gikimujafudazovavavop.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wakarizazarifivegone.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/85313838017.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/20nnml9fsi37r2pick7rvht915/buvurolemaje.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d808b6deb47---60826163210.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811604ac198---67141063942.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe104bc42---75283481044.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4a2a90d7677cc9fbcfe92397608cd3b2/26332587746.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/dujiwuw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a813ccc90e4---wexomutepugepimul.pdfIn PDF document text
    • http://krupongs.com/images/file/35617500278.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/petusawimikabujigux.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fuzudabijawulasatedaxe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r2ldrl00vft51kticggvsbdj54/migut.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/10364551118.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/bofezomidilirev.pdfIn PDF document text
    • http://lovesenergy.com/file/97294698277.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/55546558046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bats+echolocation+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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 17212 bytes
SHA-256: 9627376d01e0886cc0913c52360b00bc4c6da61f423bc649f0a23fb888940600
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 10672 bytes
SHA-256: 8bdf372dace1d40e6c1b419ebc7989aeec1223cae8701315dd7149ac09651b56

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