Malicious PDF — malware analysis report

Static analysis result for SHA-256 796a750497ad1125…

MALICIOUS

PDF

98.2 KB Created: 2021-08-22 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 652d99807df30bf0bea03dcb4b575efc SHA-1: 1b0a03f7edd6ac16720d6335e86740548ea8db21 SHA-256: 796a750497ad1125e3a0fa89df86f3a91ed688ce5a8fda925d353b95e3f5e851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a likely redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://archgeo-leszno.pl/uploads/userfiles/files/refasexiz.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cj565mkkc1ldba4uio45qj0p7t/naweko.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927c5e17959---58312921689.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07a72d984---solizozudinoratulorof.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/senelizemegovenipa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/16dc11f350bee143348ae41837eb66d3/59528952823.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/napunogofogijoxuzusi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/73295869539.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/kanimemutaf.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k3fns6c8r45dtkhmb5jufrf711/9883543429.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/07c9383daf8414df724ada5610cd04ef/29408510363.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/gunazegepatibakalafe.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/rakijexamujefapilide.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6bj65380dfc2111o535cifkjo2/8891895013.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/valumufuzu.pdfIn PDF document text
    • http://cke.hk/userfiles/dugopubikarasalaxeguga.pdfIn PDF document text
    • https://stopserv.ru/files/file/raramidovabagor.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160acabd3ac154---86533323193.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/23526223460.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589f472f24---sotixufubib.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/24824005823.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/93990269058.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b239a4116---tekoj.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/19872822329.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/demumizabujixivep.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/83248122358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentos+da+metodologia+cientifica+marconi+e+lakatosPDF 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_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 20568 bytes
SHA-256: 5481a3d8feb91b7406ea817391c8d7cc24e788501a2e4207e537883468e6452c
font_01_sfnt_off000145e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFF 10988 bytes
SHA-256: 610b52ee00812be7226cd2cdd4109c70c5b65c05da560c5dec802d6370f8db89