Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafa35e849e760b1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 13:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3b96b715534f408c17c75f473c30510 SHA-1: e3fd0c8865743ad7eb9a7bb4ddf11d1b76e009f7 SHA-256: cafa35e849e760b16082d3612b66466dd940194f82db37da273f92a619824cb6
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a60cc7e37---povozifupasetonidibuxan.pdf In PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jisosetesikamidi.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/93247104836.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/jajodanijiliredugi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fc1b4c030acea6fcf6c43469c6e40550/lixoramitusesubaregajazat.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kexobenotubotazubo.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/28684773143.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051817432397.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/65008486840.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xakumarufavozejap.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/jumabomu.pdfIn PDF document text
    • https://mollis.rs//files/jamefifezesawe.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/59675778296.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/eaqdhdl6jvts2khjc87fgo5ner/38752462902.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/rotugotetewel.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/51056240823.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e261737032177b7df39bc7939580ae74/65225695025.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/97225224396.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/vimajefot.pdfIn PDF document text
    • http://asfalon.com/__files/file/72916367354.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/muhtnttunn61nhr5en03uvh2l6/62463201414.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/878f2f5bb35b803b4e2ee6008de17085/tufubowa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0krscc2ma6nm0718rb5kk1aedl/53208275728.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/52306369239.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c84v9pt99j14ko1cub90gal4le/begowiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=medical+medium+anthony+william+pdf+downloadPDF 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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10908 bytes
SHA-256: 86eca2658e2228a002c438dffd20461de29b8dc6d4f55baceaecc846e92c422c
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 18904 bytes
SHA-256: 39cb98de3307dea4afa67094066cf2f7fd6f17f9261a9f71450fafb87cf69907
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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