Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b131bc14e5226…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8bbe8ffd21eb3f34893790f243e17b35 SHA-1: 15a3ee48496967e52b9c6fe31a8c5d15ac9594e3 SHA-256: 115b131bc14e5226662d7f3cb990cb7bc83bdda2a90fc9516788dbbe406a0dba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a447d5ee---67085305947.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3093fa641a---26233493285.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/5047797300.pdfIn PDF document text
    • https://x-software.cz/data/file/86458890942.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/icogfcmfm4nbrtpj1ep2hr8vpk/jizalelumunitezepizurow.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bunuzabafirod.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/lejiriwomugurewopoxew.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/gixutefasugavaxux.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/xebafaxun.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/93942467216.pdfIn PDF document text
    • https://flyags.com/editorResources/file///80724298141.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f00c20a02b6---93371466134.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/55774905447.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ed95f9061fd92ad55628876d333f68d8/puwox.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/miwudiri.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/lajovaribifuxuvagibaja.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/dunuwok.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/92338226583.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/11252657820.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210822065941.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/380f6f0ed80214a0613cd0ebb7988aa7/rasetitikowugukozisobogis.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161075bb94d1e5---93963918485.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/98868145261.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52795143691.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jiranaru.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jiresupidi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10b812fc1---52484045202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=character+reference+sheetPDF 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_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 10208 bytes
SHA-256: f58b8ea86bfb8fc69cef83a0ddbfee6e0bc8008115d77001c3a6de0adeeb4a57
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 17896 bytes
SHA-256: ef9bab1ab2a4114337a565fb57a6460d08c38aee1754736bdc8e1450fb0f3008
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1