Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9499aacd2d9ebb6…

MALICIOUS

PDF

102.3 KB Created: 2021-07-08 09:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7aace9e09a5f5ecec4ce2f6928435084 SHA-1: f2f113c839e8db533e17a73cc2c30adca8170bd3 SHA-256: d9499aacd2d9ebb6829c5ccfc3198ae8261fe004aec70cab63aa9124a68bb488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://crewmak.ru/uplcv?utm_term=plus+one+english+his+first+flight+questions+and+answers PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9b7e4ac67e4e4f5d4b5b58e8973672/28687723866.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/72a06e20b2517dd9a040c6da85730b47/pisedesuluwujuv.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/36bafd655b1f3856564cd37b835f931d/jebuxebidotumepa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d7bd154f---98696707764.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sukagaliw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44cdb001---javopugugilivubofuxafow.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8df12f042---pezulopemejajakoron.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b480a8ad---mawuzidizinikipoxevadopes.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa33efecc---pawuwufonitaxizetadaw.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/48378b673a7a968679445bcf44c9e7fe/limujowaseguto.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b1a09387---wegekit.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079576f0c9d4---32488562092.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qklgstfpq3cpnse19dqg36ghj2/22853374396.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/lisuzizanafipuwukemiseli.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nizimevisut.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3d40736b4134989b6eba3b3e36e14ae/rijirejifokuzu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30dd4eb072---lupovumobefidelelaw.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/mumoxako.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/60122672860.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/041309178847.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qmt82fqe2o2b72vvepk5ri9m0a/pikogufugijamelumawo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e75e8527---vapivedopa.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 1704 bytes
SHA-256: 2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 10964 bytes
SHA-256: 9f742048d3240de08c00d9b1687a48e4cbf3dac60e1efbf0bbe0f21aa3f3e67b
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off000145c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C4 17016 bytes
SHA-256: 32de500821e72f8ac71afc6cce9f41123f821186a7336d5f47480baedd8e6d62
font_04_sfnt_off0001720e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1720E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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