Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf791dbf63afd7c9…

MALICIOUS

PDF

104.4 KB Created: 2021-08-07 01:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 907b5afbd969ca28ffdf6cb40eebb718 SHA-1: 2aea8618a2a702ffefa270a715ea2b19c7a126b4 SHA-256: bf791dbf63afd7c98a04f72aefa855ee042df75f2dec25c4131615a0cfbf32b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised websites, likely intended to host and distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the use of compromised infrastructure for hosting. No scripts were extracted, but the overall structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://eugensa.lt/app/webroot/uploads/userfiles/files/kevisibojisigujiwebopeme.pdf In PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/89570065942.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/likozunovoruzut.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/tisebokumakap.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/28646645164.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1ab81imp184r7f0rtke6ine425/84104891644.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vfdggrmmg7rcsh56qvrjtbe57c/34818614303.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e8178dacdb65ae02c9c34cfb93ad9efb/zetiw.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3ae231f35---86087092425.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/kvln03db3tcqqqq7bkpsgejgsa/23697970132.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/70487608885.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/46064074444.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/bevuparemuw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3cbb4f1bfd47ac70d8d2619d704e7d7b/tulikoxakokudobowi.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5803afef1491128f7146fb02ab481cd1/zomufobudafon.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed44d814b---gagasofipigopav.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/puvinawurebebuj.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/55355226559.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7875514f2c96399e434a145b360420c/41137938472.pdfIn PDF document text
    • https://suksesunited.com/contents//files/gudijowarivevinafeduju.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zebikemuzopi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fimugugexuxexizemat.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j7evlo68j9sermr36nr6svcd4g/39891341258.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/70948055106.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddc43d6ab---wumoso.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/zugetuduwawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+start+a+workout+planPDF 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_off00013776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8D 10292 bytes
SHA-256: 9f41057dd687de12128fa0d2209198010ed2fe7a57f74ddacedee816c2e4729d
font_02_sfnt_off000166e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E1 17312 bytes
SHA-256: 742f628339167d962b4a79cf09a65d13addd6daf7a5d88a888299bca5b23d2b3

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