Malicious PDF — malware analysis report

Static analysis result for SHA-256 33063be24d9ddd48…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 21:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5db899abe041dc735fd4201f63b2c86 SHA-1: ff8b21c70f5a0bddbc5f9f23b1d44c9574995972 SHA-256: 33063be24d9ddd48ebadf78c276436b16476c6ed1fe435a2a1ff7be243b570cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content. Although no scripts were explicitly extracted, the nature of the URLs and the detection suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160818f57548a4---watavenesejopoxifuxavomoj.pdf In PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49600262628.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zuged.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8e2bv0lcqkb0uct1dea4g26ot7/pipobafawe.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33495271631.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/6642523655.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/88a5f39b19c2a167d66ec3a732a23ffb/jowuzusanijawevef.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/28337680585.pdfIn PDF document text
    • http://ktcz.eu/files/files/29878812537.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fkeuajndt2p2qop4paa2pa8on4/89950797851.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ef33f092---vibenapazesi.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/37882811441.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fefavuxipusumojado.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c780bc448d9---mirivolunezepub.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/dabuxufoduwumewijaliz.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3229e526d---27873675896.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/08h0p8r9t4bpilkd37il38hfuu/15037529566.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/4198330553.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/36819072809.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/86772930446.pdfIn PDF document text
    • http://kccmaul.com/files/files/tafom.pdfIn PDF document text
    • https://susta.vn/userfiles/file/46211020123.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2c5bdegangh5qetb32rdlvrrim/naruvigukibafixepak.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/81ai7bk45077cbt44ac8uljrim/48782823948.pdfIn PDF document text
    • https://digireg.gr/upload/nabufazabevunabet.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pidibovixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ionic+hybrid+mobile+app+development+pdf+downloadPDF 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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 17028 bytes
SHA-256: 909823ec02b675b93cf686d3f4e7b02a4c8ca062c339498dada5a041810bd63d
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 11072 bytes
SHA-256: 783a679cb7b7fe39f35d8d65065014c92abca01319a1d43165a574a782003197

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