Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22fbdfa4b61b7cc…

MALICIOUS

PDF

222.2 KB Created: 2021-06-30 07:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f66d4331b741e4407ad9de70558e929d SHA-1: d9e7d371e68d6c2280e6ff02d1d2edfb27782f84 SHA-256: a22fbdfa4b61b7cc1416ba0b2430e0588530fbebc6cdfc65c3bfd6b43403d78a
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with one prominent URL identified as an SEO redirector likely used for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links suggests the document's primary purpose is to trick the user into navigating to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9534

Heuristics 5

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=avatar+the+last+airbender+earth+symbol PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0afcb3b9e---94010825539.pdfIn PDF document text
    • https://actorconseil.com/files/file/64111946455.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/balula.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gpnofi5qs2rkp6e1f9u20kgvou/59910276469.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9bd07646---jurujonobetepabatenugojiw.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160779e1235a6a---28725017306.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1700ab93---12619479138.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/33526767066.pdfIn PDF document text
    • http://muszempilla.com/files/file/77733748422.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0f3f4e49fe4e046e627d2a6936c3341a/buwizope.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/1232660586.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d7a230e3f810790d767aefc6dd3fa68c/ximonenavew.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/tazojarorono.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/81f129f93c12c85a9a507c945100e74b/xiladeget.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b1bd51a3d0126feeed546c53c829b0bf/zinimi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b63889ca5---fosobigoxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f3a2844---80707502737.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/vilegisogutiremolil.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/85567770030.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98087b2dd---sapefi.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nikazoganaloda.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417fc2cf5f---60238672339.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7fda199f35a011c1e3eb65e47df4832d/dusujuviwosopedizegap.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071eefe6f6b5---31902795825.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f2c9fd06---noredan.pdfIn PDF document text
    • http://terminsk.by/pics/files/10316453088.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c05de30f9---91868327826.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEA2 20236 bytes
SHA-256: 0a24b70ce4996ae3b1fffc205368e84e073652ed9f81b8b138262078d06c851f
font_01_sfnt_off0003107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3107F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00032896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32896 10816 bytes
SHA-256: a9b9b04a23d6e8f8f0d2fab2613572843bd77e4c0e433930a77c703dfb593452
font_03_sfnt_off00034157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34157 13580 bytes
SHA-256: 2e55380a4a00f84d5681aaad8a4d37b50be3d2d1cf7f709165bc3a6b4a059410

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