Malicious PDF — malware analysis report

Static analysis result for SHA-256 908a79959ed087ab…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 207fa524de991035a6dd2ff28ac4bfbc SHA-1: 38069c57fa6dbb7cfbe2c1e848618aaf3c545a19 SHA-256: 908a79959ed087abbf32468a84f027708a56e06f676cdd5e8fca7b7b814f5879
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or scam attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608489fd6bfa2---wipuwiwufivo.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdcd34cdc4---fafidimabetober.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tebunijokevonedukon.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60840094946.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a36f38a9f08d00d94c0347a5a4075f4b/66018062385.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/35822175483.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/93404991675.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1718ea30ed---pafotuxog.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/51564763650.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf79020f1de---wezoseviwomumuvus.pdfIn PDF document text
    • https://topupdana.com/contents//files/vedibibine.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c33o2upis14ogg6raq1u2eeees/99609587378.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0e2cca31---gewezokubekefaxawabofi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ccb7234a---34172272292.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/31c32ac53be54b0f0528f9ed28a8a9eb/35529845932.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/27801746732.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/tofefirunexel.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073747609fd4---wujofirowir.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///mugalemilemok.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4342b744---28826102805.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/incsbgr4g7tcp5a6h2ah6uh2br/bagusewifuga.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/bidadigusulugafe.pdfIn PDF document text
    • http://portableandcool.com/files/files/roridesokokevow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rhyolite+is+an+example+ofPDF 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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 10784 bytes
SHA-256: 8afc21f6af5489852d45a1ff0b5ee08760269201f1fbbc7fdbd3a35e5bef6b1d
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 17668 bytes
SHA-256: 3a65f475bd81fec32f7357daee2a26cb2a722462b7b8465879240485312ec62a
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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