Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b730b943c15c2c7…

MALICIOUS

PDF

88.7 KB Created: 2021-08-04 04:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 735d7244b6a468f3e808a2bdd4914ed2 SHA-1: 3a74cce845dce365131f32def6b0a7b11a30c47a SHA-256: 1b730b943c15c2c711b7d9e8700c343fa36af49b94a371b6d4e6544e1b6d66ce
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576cdb6ddb---11254091447.pdf In PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sonegilutebe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1c30bad3---rufuwajojegigagokixoletem.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804cad7f08f---97664520764.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/salifuvizo.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/bimaxefemapipita.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/sizujigebagetapifazus.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/80c811cadce75bfbe643225c5da1a285/zomuwezuwimojavedefuzo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce226c1b27---11807908212.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/21a5938bea9a0535ebdf82b8778bb79e/93305362597.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/risejonenusefijifurox.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/jesozisupiwavetitu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c91d7ae00---bovematijerowirupi.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/9400480919.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b1364i9duo1tjfeb8mubcc66i7/43221087749.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607623283dbfd---99390088118.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c426d5106ba249f0ad0f73d572e7251b/gapakexu.pdfIn PDF document text
    • https://phr4u.com/files/fagomimakosewasuzegilure.pdfIn PDF document text
    • https://laser123.com/geektic/files/rikibawa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3d741314f---subuduju.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d855c7e647---limonujenigumazaromo.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/taxobazigobepaw.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1dc8bcb277f072694513b2194892640f/44874870702.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4423_20210804101440.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/88888673056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=attack+on+titan+%28live-action+movie%29+part+2+end+of+the+worldPDF 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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 11252 bytes
SHA-256: 48edc5978c72dc91fc3e594a2d6f8f5a2ea8674bdee620f40c68116b4a54f7e7
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 17244 bytes
SHA-256: 2ea4853a8d02e2b32ec1d0136a42805fdb76b311591ed9b5eec3dc6340ec1e90