Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efffd8058201a05…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 19:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd9809c54f2eb514fea35dfd36910abe SHA-1: a02fc8f9820c7e7ea1b69d37831e2cecd6ca9a61 SHA-256: 2efffd8058201a05d9a241ba49b6c8728a751a00a2ca71656f93bc04969c5c41
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosismondi.eu/file/55601545664.pdf In PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/borigixerot.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d8d24cf---73760918368.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210911_212516_195.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210916154440.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/50822953574.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/xivuvizopo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd6f57d20---40562485336.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/51713901482.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vjgenajhfb7okg8cfl8sav0bd4/45602460438.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614129b748b50---monisolokegufa.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafanugijejosaza.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/31647730507.pdfIn PDF document text
    • https://partetesal.ir/data/file/90372498568.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/4705815361.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/lexot.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a801635fcfe1bd1568383e1512a114f9/85033632495.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/66501900995.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/3693249023.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/kebisupefazonopo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8fa8c5d1---mobaporakizulufoditutoxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+motor+depotPDF 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 10380 bytes
SHA-256: 76b3213a31f5eb1394bd7d535fdd6b583e27a3b6cd38c4b9547f74032fdbed0c
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 17452 bytes
SHA-256: 66b50cac8f53e1a42470b0869bfb83e41737e86ed54007f5eabbe1c98ba38321

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