Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a58da7fe6a5a23…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 06:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e8f20ae63c753d5568e4fc00634a569 SHA-1: f347d574ac9552ec14311e0adbf0d43486034d62 SHA-256: 84a58da7fe6a5a23f778df99edf6b41b468e679666e486fbbcb284a5a5c12f35
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The embedded URLs suggest a tactic of distributing malicious content through seemingly legitimate but compromised web infrastructure. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090074129801---82152545396.pdf In PDF document text
    • http://laboratoriologos.it/userfiles/files/44326886153.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e246ae71---xekuzalumatovojasodeb.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d9f24d2b1626b531bafa7616a8ad5779/tulofu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/71afd329ad4d8576e3da7731749ec4e2/59867532730.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f4e9ea5d17b5468ba7648914c15d2034/27560373666.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/13309372217.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ade099694---1231330560.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/20807102232.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/24558319428.pdfIn PDF document text
    • https://atlantidegattico.it/file/5890398375.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/diveriwanoxalegixoxagun.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/99003047669.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607008b4466e9---90368048834.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728c7e91e2e---zigalun.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/ginig.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/38329419505.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/17347679270.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beebe7a9a1---vuwaguvusesaba.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/17941436660.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/85358238608.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/20738415311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=21+draw+book+pdfPDF 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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 16456 bytes
SHA-256: 36204bdac7d9699fa6c94714cce60d2469d769fba0d2bdb7a1395f1915402e77
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10244 bytes
SHA-256: a4f303816344ffdc835efc8321d0cf03e2cd7879c9b962e12c6b339d3f9fcbda

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