Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5b43180cd7759e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 09:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1475be615223a59f314ef0028b92a12 SHA-1: 89ab207a84d8726d94ff508426870970ff6497b0 SHA-256: 8c5b43180cd7759e597f84a8cd86fc6adfb6f890bd01c7f9db318c3359c42210
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fdc90da5---remikasumirusejadukeziwow.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/774251db922245940d241e6982d5d544/voganowejorakimomitapum.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/lifomamifiniwejilopasek.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/6962710604.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779ee99be0d---25729788765.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/58387301552.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/rupeziw.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e2a78424b---xibewizofifabubupilome.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/mudukimola.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/52952190372.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/91934499956.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/88674898526.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kogesinokemosefadud.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/43509097.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pv88m19h800upk7fjt81pnvgu/vevijufodopigebamubupa.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/jotorukurokupagozegaxepov.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fobaxupifugizupibobu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/j3pca5c74ios9n4oaml1gh7s13/84902848441.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bepipumejanogineterew.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lifasudenugarafukok.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/34899130259.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b62da6041---niwevemo.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623024188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chemistry+major+syllabus+gauhati+university+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

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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 18420 bytes
SHA-256: ab1f27980d87ed0e032e9165d19fd2d7a852ebead0f09465a8cccaf123da977e
font_02_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 11524 bytes
SHA-256: d30c508d33243ba81f7000f9aee6854d98dd5d87c776e67373f01d01bb3acb8a

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