Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c41aa5be99cb344…

MALICIOUS

PDF

99.6 KB Created: 2021-07-24 20:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92a0772621a418b26c234ae48aa50ac0 SHA-1: 4cb24d7e9fd67ecd214c3e1f90221fe2e15b8b86 SHA-256: 3c41aa5be99cb344d78d756b600ded9a51a32d253e9633b6cfb2dec0cf28ee3f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084be0548b68---73125537815.pdf In PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/8690437934.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/oiphc4obsmu03he9nt1vp2r6a3/3892358378.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/29496694881.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/mitiradozuvikuxijami.pdfIn PDF document text
    • http://samtekelektrik.com/files/dugixoxoluwidiveregobu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2edb18e2---zidodomun.pdfIn PDF document text
    • http://azizolace.cz/images/file/47229418891.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fonila.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/19416931705.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/be3kea238fng3qvq49va4vsguf/71234944169.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c117781e2f---gewutenuzisope.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/55122695988.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5f352a9d---wumogaxeboxisur.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/96867530943.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ee2474604930208dfc09149da02eca7/sozewugigopunod.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/02iheqss87mn0q4mn0j3i9ti19/sokulolubutenikeru.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f16ad8465bdb237675ba430477dc077d/pemeperukudamivuvube.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d04e8c11ffa1df31e814e4d6c4bf3750/37885995255.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ffba257e---wegukidifotipebekuj.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a477390343a---takotif.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mugogukorujawigenud.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/datiduxanifuvop.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/28283740926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=silenced+2011+korean+movie+eng+sub+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 17368 bytes
SHA-256: 497ff760af426c211d418c5a8deb36903cbaa7f4f4d6bb6f061f2797193349f7
font_02_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 11468 bytes
SHA-256: 076740f8f91c4cc9cbee5c4eabe64d92c9b6f030537778a1d055a9264491588a
font_03_sfnt_off00014578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 18508 bytes
SHA-256: c6da0d0c4d00b0f0ffdda177c69a639d28ebfef56ac87085af196e565bb0e9c1
font_04_sfnt_off0001755c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755C 2132 bytes
SHA-256: d2940c87a12cb6996c6de3fabc22a016368ee55a1d4d032506558b4e497d4ae0

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