Malicious PDF — malware analysis report

Static analysis result for SHA-256 293c8d477f5058e2…

MALICIOUS

PDF

95.9 KB Created: 2021-06-28 06:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb8fbb11249b62b6e5648de035261aa3 SHA-1: e5b4ed2a01509401c7b8a89b3fbc6e16df37d523 SHA-256: 293c8d477f5058e23fdf5ea1fd10020604d59dbbf6f67dfa366956759b9418cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous embedded URLs that point to external domains, many of which appear to be compromised or disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=unstained+cheek+cells PDF link annotation
    • https://kovtec.pl/eurostyl/photos/file/garumejen.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0fc405d---97602475358.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/6511416524.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/63259722770.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/45708705031.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/80536460383.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/99175226758.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c101efe00b1cd2b1c75840a620801f96/23233338242.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/njulh4roi63fqg5u2qhtce2i61/79045395237.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d90685f7---vewenujamemubuvur.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/719a241fe88ce7297620774779240a4c/49467123945.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5067e6a734---witoxafawitagotu.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/59188891727.pdfIn PDF document text
    • http://araonline.hu/uploads/file/19191208437.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gobozevuvalufatedopevosag.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c140144baf1---18720358939.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9d7102f4---55067685085.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/katikadudikaxo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7uruu7kenfei4l4m1v5p7651oo/77383499487.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rggr4fq2j6tu9qdvbe03iiq0dl/jukewatetubikomala.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0087eb9f53---33154918179.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeba74c5a3---13462708419.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5b60ddd17025f36d8b864c0b5128b69a/71369748469.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-25/20210525083128390720.pdfIn PDF document text
    • 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_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 18612 bytes
SHA-256: a035ef0857e09305eabc8683a1d036457e16ae1365a6da5ef8c834876f5b8e33
font_01_sfnt_off0001437a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B91 10348 bytes
SHA-256: 3f5d111b990f989c9649a10b3d576a934274e7bbaf1ceb826efbd74c3ff1cd4f

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