Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b7aa4296604eeb…

MALICIOUS

PDF

94.9 KB Created: 2021-06-25 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3943d97326cafb01929bb893542a92db SHA-1: 0d5510c3da9af069b179635c2b729f7930d798bf SHA-256: 13b7aa4296604eebb92565dd409790e5fdbc2bda46187675b0b1ffd2c298fadd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee36cdd1c4---60846491613.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8fqdr54hnbj5pm8quo3fgqcqk6/57984032819.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/830dffe68f18c586728d28c7763e3ada/xoduxuwilapakakelupep.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/90671298520.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f3ed891---71555245966.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/66d8722d349fcb7c381b5aa258dbc979/tojukakiwaloxodo.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/juboxi.pdfIn PDF document text
    • https://agermag.ro/mm/file/26821526545.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/tupinusekusakikafose.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9d20320d4b6d80c9b8f525e758efa69d/dekofo.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/nupenugawapojuf.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5qmgor960rrv8l936ieelorhq0/xudubawuzunaniveroze.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8b9693d7d525a16b9eceeb5ec85141c/42085094157.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/11765017556.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/493d287fb1a4cffddb7eb1fd831ca75f/nizixivo.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/2757685500.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1d2bae9e---23567717293.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/tesaj.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa2dug4nd9895iir9klodchmja/xujarorofumazojazuzoza.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/1859691490.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jezukozu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a554cacc321---gadedos.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f825fe5f3vr0cdmdueqnb1g1t0/ritafarugizuxune.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/wazavudatojezokomuzoxuwew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=easy+dinner+party+entreesPDF 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_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 10316 bytes
SHA-256: a520b8581c45fa6d4ecc760c29931f60482936963dfe6c97e8cee601eefcabbf
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 17744 bytes
SHA-256: 7b9cf904c553f85b1c6213b07d7e93affe3a9370b424871843a07cbce475b535

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