Malicious PDF — malware analysis report

Static analysis result for SHA-256 36984b233a87f176…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 06:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d56edbabad9454e3734d629a1d6d5a24 SHA-1: 70f712b0ac539394588af9c2c5e6e969c274e550 SHA-256: 36984b233a87f17633752082f675c379026ef26e0944b47975f5288b5bf68952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites, likely to distribute further malware or phishing content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to lure victims through search engine optimization.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53dfaef09---varet.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9eed1c9bf70d25b0b192f788022a803e/92413839888.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/90931441363.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/11683917794.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0d642914f8f7394c155324e9399edb7e/18130151974.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/77c16d0baacb136d6091c90caa4d4c00/45143095396.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607becbde2a88---gulivosare.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/dofaxamizepijadu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/22734749673.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/saxibedanalizujoxaxed.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/futasiva.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xugaleviliminitik.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c397b522606d538161dedc029f5b9f9f/45867093422.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/wajapewexulefegudir.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/mimaxafakemul.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nsp1lni3a8igl02tu72v1ces67/64822896455.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bae8c605380a9074bca24bebaf9f9f14/30826216588.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/331c59a0846a74f5cbf91514707eaf56/64791837509.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fc644151---nujibunutaluzigo.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/48584928848.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/sakowituvibadov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=snow+white+prince+charming+song+lyricsPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 17484 bytes
SHA-256: bc7990e0a3d326ef97947f254f34f41d4d8cb878bb912d0689a48735ef5d49c4
font_01_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 11096 bytes
SHA-256: 0d8d1cd2700d9d99b086779f29073356ccb541184265498dfc44f45b8747be3f

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