Malicious PDF — malware analysis report

Static analysis result for SHA-256 f885d6822dd04a61…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 00:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8caff46ff346a0cdff5f0eea5e9e1add SHA-1: 55f4b056bf14a2a1c9ff89d05942324587a34f4d SHA-256: f885d6822dd04a61ad3a1cdef7e08a12c033e4a5870317c1cb0fa659eae4ecd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute further malicious content. The URLs indicate a phishing attempt, likely to trick users into downloading a malicious payload disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/57e7dc48189471f8023d2408ff47f3a4/97513891411.pdf In PDF document text
    • http://short-story.ru/upload/file/mudadutuwusago.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160df78eb8042d---durujineruseganitawol.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c80d74d7a---5750907615.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/5ad61b96cb82e97c391bc86730454c2d/zisuganoner.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jobugeguxejil.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/be960beb770695dd251c9205cecc3b54/ginisumatapedutedipuwata.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mulodumog.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105261022.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/72335886627.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/xamexolo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9801bd6db5d5ba3d9a69e0e6fd1ecd5f/kojixenederiwaxisigitigad.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7842445c8---benelu.pdfIn PDF document text
    • http://expresskaliski.info/file/lojudejobozenolinadegut.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9383bf7eb49dccfdcfa70a58f9feb34b/18890996008.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a84066705---92615745863.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76401579105.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/5849305004.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/95471323760.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/fojimubusatuvetakojaka.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4ed99067---bafopi.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/893329269.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nabawekisut.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a26a88c28b79449f79494d34afe0a421/nalaguxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=blank+mileage+reimbursement+form+pdfPDF 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_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 16980 bytes
SHA-256: 52d1e7357cbf1c785d0d3a4ace1d7210c276066798d0b92db7e0e2e55623034c
font_01_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 11228 bytes
SHA-256: 9c4fd1bcb2c30b2b1ded4b7e7939124b2d869d0a448484257f3a3dc013cdd264

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