Malicious PDF — malware analysis report

Static analysis result for SHA-256 28366d6ca519c949…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47f4047906904de4be4e5bc806fc0930 SHA-1: d4b16c593ff3f10d0b0e4bda97c1b0362a72f574 SHA-256: 28366d6ca519c9497c980521b24874bb1874ce074763ab27b9c88c71512c3534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://muzeumostrowiec.pl/obrazy/file/28434500428.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c7019fb02177a77fa0217a8927b14d0b/nizevofarunenarazo.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eba5e283f---65973449167.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/42hah8anst09gbsajaaqgb8br0/35616451223.pdf
    • http://braciszewska-klimek.pl/fck_files/file/43972419940.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0f284b5af---fidirulivipekujamuj.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6442f93cd6---9981199965.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ab1377523526d761a754be1cd4ec3c5f/solejamorekazaxotak.pdf
    • https://akapacha.com/userfiles/file/3019117315.pdf
    • http://knshzj.com/CKEdit/upload/files/72299228658.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822887df57b---56803815411.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/guvizisug.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vtcgqhnltp95mahk9uqbsdrd0/bigofanazowukerulete.pdf
    • http://sportgalaktik.sk/userfiles/file/fomox.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/flshnbinfj4bqkl6iknvn24nm5/fogofa.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/najozax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=suffragettes+movement+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 16792 bytes
font_01_sfnt_off0000fe21.bin
6e710ce9209c0b45aeb01668ea3c1d3c25e226fc63eec18a07545734aca4555d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10776 bytes
font_02_sfnt_off00011705.bin
9e8004587d5526b35bdf9ef76d0c144289de0750b5235fd61ae8732229dd892c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16832 bytes

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