Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f15cf3dcedb9e0b…

MALICIOUS

PDF

114.8 KB Created: 2021-06-29 14:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0ed8a9a5e6f115287a1f9bf0fa382733 SHA-1: a9c68688b4a47e4ead5631a1c26910e380049f0d SHA-256: 5f15cf3dcedb9e0b25d1f3075a7621b6f2f7ffbc7b055ea0ef000711a0de7cc4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s9p5jtauqaqcj4jenp2s1uh3nf/52342364112.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/adb9a34ffbbbc0cafd7155d36ec154fa/nurasejizedoxopesizuleb.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/85125091661.pdfIn PDF document text
    • https://soltendance.com/stockages/files/melabemajarogiwaraxuva.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d219eeee501d930d5ca96a1a498932fb/jepax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf31472767---rirojapiwolikuxutedir.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa53a63b9---dakevuwar.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607966287dc8b---60279301385.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa243f7b091---87687864561.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b98384a7---14929331080.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9ae4c5c7d1b45fd7e78ea6cfe426b82d/wukufidinunifitetisaxot.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc0d661c1---68379700946.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/23222885926.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1e5ce6b1---surunuvudipakiroxepuvamup.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/17988544788.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c98e7c0f3448b04d52a7c117c2880f25/76271360745.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f491c91c1---fifumulu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6eff6adef34766d0761c72af8f38a8c3/xetekozejomuwaz.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4f66a576d4c8d0d44540fb5ebdaa2bf9/xutujezavowedemadenivofag.pdfIn PDF document text
    • http://epmachine.ru/d/files/gekalimudopiteguzi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607118e56f2bd---devefagenelesogeve.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75dc3ad82---42640560781.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/waduvarawimeritufatoboru.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5qe8rkg1seig8utfn7fhiur57/25830410247.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hllknepgl7kqbp1vbsivi7rkm2/xatunamivemetufezuw.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tuukkqj80rj2ks0fbrklu0nr8i/81788317928.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/39895439079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=derive+ideal+gas+equationPDF 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_off00015d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D55 18240 bytes
SHA-256: acccc967d7df5f60842b6b90213549ee1a976c60f2960c29558a7c3d725087d2
font_01_sfnt_off00018d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7A 10736 bytes
SHA-256: 9f0aa2342b34a73ee9bba36df2e2f26d25478bc7f55fa58b0effcd4bb2baec74
font_02_sfnt_off0001a5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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