Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb17db104081cdf…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 13:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7b6d25944e42d63f5394d9112b6ed4c6 SHA-1: 4bd785e172d9802c9e5ea8550a7cfb73c59e6d5f SHA-256: 2fb17db104081cdfe1363afa7231c9f9a3cd1cc83c7f8ae4a8c80a37e520b77e
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/18092afeee42a3b0f8ec685b128e4bf0/27740627429.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/657982a74ae2b5fe2a90cd620d4e69cd/xozujiwo.pdfIn PDF document text
    • http://df-foundry.net/d/files/koparibejumaduzularugifu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e5567f2---90097056174.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5f77a50cd6b962f14a1498b5369cab5/74478810989.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfcdfabccf---lovapususegefobisubeto.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16096c6ef37a26---moweromixoxejejutulobesif.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/29845358487.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5941ad6e6---jamonolesovoruwit.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3621d6e369---fizadukimizeginerulid.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70b1c4806e---62617549100.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de6315860---34142919403.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05a5aa5784---74126907120.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tovixigopa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8e930842---zojakiletugigasuva.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/13cacaab684481b5a88abba34d1ef9eb/pokumavekuviban.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/fobazawegedasidimonomika.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045985ddf7---najep.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0405fd14---jusakatinixesaje.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04e3bc3ce4---fexafatomosaj.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/49413184869.pdfIn PDF document text
    • http://geose.ru/userfiles/file/bafadodiri.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k1u1o4krm8b2v6vk2dgjl7j34a/supuserefesexomew.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/fitobazafigefewiwidaviso.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f79df9213005e71fcddcb1981365cc3a/72601769506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+fate+of+the+furious+ytsPDF 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
stream_005_off000118a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118A7 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 27752 bytes
SHA-256: 35feefd6720e8c5205d5d37d4f50d2477dda60eb71b0259a61561743d9795144
font_03_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 10340 bytes
SHA-256: e0d98fb6a122a362c2e17842d4d9f0816c57bf9138885258f0b40114320f1e89
font_04_sfnt_off00014c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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