Malicious PDF — malware analysis report

Static analysis result for SHA-256 b921222b090a7b94…

MALICIOUS

PDF

90.4 KB Created: 2021-07-25 07:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96732a801ef0fe7ee40da943e30d633f SHA-1: 6a2bdaf8bfde90c950d34e4d8d59801e68817939 SHA-256: b921222b090a7b948fd43290835b178ae0c280c8c77bfbaeba749808b6625a98
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb380cd85---66900739996.pdf In PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nfpp4cejl92f04mtv4jqjint86/berakerolexivitozopuvutul.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/97975134039.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26999050832.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c496ca1247dfc07de6494b6350095a3f/96374068205.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e0a0e8a7---13554987405.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc27d8d0be---42817437629.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/53558159065.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/74516832383.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3801641cb2c9c819c207504a106f2789/wedirezugipoboj.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/p8gm1k4pprb01u02j31pjdc2e7/wibemobifadujesolexovug.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/99768628497.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/23326894472.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/61038846820.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64659b4dc7388813d41654fb2bde4dfa/towed.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/kirov.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/85541160207.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4c30dc9cc---rajom.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806779e0a5d---74942678233.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc55b53d0---46324579449.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/56046684836.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a37bced3f0---61398583580.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/96175719171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ventajas+y+desventajas+de+emaze+wikipediaPDF 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_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 18112 bytes
SHA-256: 81da8a4f1676c43a1a1f9d05fa791a612431f5376cfd88448d42220b5a754633
font_01_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 10804 bytes
SHA-256: d4b56af5ee62449d212cfb8d6e39fa3e4d57322ffbbb40ccce212aaf9d36b9a1

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