Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac57c29fe39ab332…

MALICIOUS

PDF

86.1 KB Created: 2021-07-21 23:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3599fd5bb4b7258f7beae7d05735ea3f SHA-1: ca826bb7e25287be6afc9511034ded4c83648124 SHA-256: ac57c29fe39ab332ab89157c57390e1e1f1f529568029a3cf94dbf92f615be9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous external PDF files hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tasteofruraleurope.eu/upload/File/20597512883.pdf In PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kusegi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75cbac0---51297543918.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eaa29j4v1l1nh5es9vo2l05bbf/tidigogitaseravetiz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/31690144753.pdfIn PDF document text
    • https://ntc-container.com/upload/files/mosonex.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/40232168467.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/49357e2ebaeee50feed1370646ffa4bd/86649095782.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d488bfafd---tewufarasegegerif.pdfIn PDF document text
    • https://maisonforville.be/documents/file/37133805959.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/57242619675.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/75677047406.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/b67alrrt7ce5js9l089hv4e2e9/49661684138.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db19e2b47af---fisuripel.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/93332875740.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/dewavijemudifeva.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/71131464722.pdfIn PDF document text
    • http://goref.ru/files/file/77398179832.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/60b2476132fea49dbb31561a39b6aec1/60299687232.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43597f001---22826315377.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c8959d0832fd1fde3caac6d9dca0f0d/16755087310.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8dbf9537e5067de1d7e5db4c5c6a213d/31247929228.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6ru31ee6slbv7cdoej8upv0gj1/fewidaraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=10+pmp+knowledge+areasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 10800 bytes
SHA-256: b4450574445cff5c574535fd006575ae0f1ed79ff661682142dcc770f10f80ca
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16932 bytes
SHA-256: 5574b8007e2c9600466de7eccfbd6cab97017411bad681663eb0f71e1b46051f
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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