Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7bc60bf2749598…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 07:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 861aa85a602e99b86968c91b00fefd18 SHA-1: 01057ec6d861286182fd14886abf1a159e1d4fc4 SHA-256: 5d7bc60bf27495988f7d7eb5f7d8216f4419bc4749ca675481129546584dd08a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or are hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF acts as a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://vico-inmobiliaria.com/ckfinder/userfiles/files/jotasaresudavejefax.pdf In PDF document text
    • http://berbun.com/user_img/file/wetox.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/sojobunirejinovalul.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/suzosuzomozazonado.pdfIn PDF document text
    • http://gtshotel.it/images/file/nosusovemutinuzuvituli.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74debd481a---vewejibatefasibuvogodop.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/7673311855.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827d43d74e8---xisaz.pdfIn PDF document text
    • http://wohntraumgmbh.at/28956207856.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/regaxedoluki.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369fbba32c---92925140991.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/belunemox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8de7719ede---fajomuz.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/2cbslq0oet2ltuaak4d00dgqg6/20881952545.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd78685c1---41799050787.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/164156e7f0c52a8b3fd79dc8e8218e4c/19736327690.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jikilab.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/mijijotijakirabanivibebu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/footglp3dqv29gcen9f9qb1cn5/sekiguxovalobux.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/acbf67c0a67f0e427e7f729fd310de3d/xuwulavokewonotufumisoz.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/58311683317.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf34536013---14979643384.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/wedajub.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/tuzowitixanujifomejoz.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/55742219813.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3ae38b3e---99262291341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+environmental+engineering+pdf+free+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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 11000 bytes
SHA-256: 25cc9e57ef8af8ee9cf3ba607919cdf9cdba4ec456b6e3e30c426f0cee3b146b
font_01_sfnt_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16712 bytes
SHA-256: 066933acb8ac5b5e117a3e5f0c4a72f92ae0110f9ebcd81a976841d5e4befce4

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