Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9eab3d99522dd8…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c23a4dbba9032256a1ee047c399890e6 SHA-1: 1c34acdaafc243ab8c0fb1a09f1b18f72c776c03 SHA-256: 3e9eab3d99522dd89aea600e936e94c58f46b5d446e0976c76d18fb39784d865
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF heuristics related to URI and link farms supports this. No scripts were extracted, limiting the ability to determine specific execution techniques beyond the initial document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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://www.myosiaffiliate.com/199trust/img/file/47211444576.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/gobujebokisukemogivunupov.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b00c848c60cfa2e482f76a696aa6b83/97318939078.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b9e96ce32cbb1530737fd5d210bf5d09/kutuve.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607590c7ce1cd---tivewebugabisujufew.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/zexaguzevazivigejemupov.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/golage.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kolazabazaxofuxadexomeril.pdfIn PDF document text
    • https://somogyplusz.hu/files/serolatubemerubumabiraka.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/laxadurojufikezopaze.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/romivezibejumirexawasom.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/gezedarebulanivujumu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738703c596---likovotegita.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eavaif80q38876fi9l3l3otnf1/pogaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a30497e7---roxozezukoxewasiti.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nunokifunixefenosorinuba.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/68772153434.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f852f570bf---datuvirakajonagirovodukej.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/53347000777.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015cba28e5---lidijexejusiwizawoborazi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c02028b---tetiwixikasatekoko.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tigan.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/nutoxof.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jawumajena.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ad6qkvkt52u3ab5m4uonar8hh5/5657149112.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/90140911331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=calligraphy+template+makerPDF 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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16220 bytes
SHA-256: de0d9443739ca8d9f677f95f271d23334632ffe3b9c94092b69d04541e7125c8
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 10544 bytes
SHA-256: bbcc4632c387da989ff9ab4a95446debef19a8637bc82ad9393e004011db4171
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1