Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5379ba2399d7e0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 22:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7d27dceafce041f0d9e40e1e36f0c9c SHA-1: c6b36f53221cb2b00626919595f18814f2590ca5 SHA-256: ea5379ba2399d7e08d3c4bc2a098e21cf3c08b9aaa3208161eec5a169f73a56b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://4darchitecture.org/img/all/gizuwofinunagasamonezazib.pdf In PDF document text
    • https://betenrealestate.com/sites/default/files/file/kizafokedufijelerisalanid.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/83816773315.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/86858434100.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/durivonexi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pevaxebevamokenusi.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/rikavixalowimetab.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ddef92840b05ef28b961d18977baa6a6/6875695302.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bb053a6---28112129703.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/51447618381.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/7326321206.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/61360450185.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b651db067e2---lemikitumuvogiwigolo.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/34642358067.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/mibodamegavilametidazela.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/najizakavolowuzumavuj.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/78944392316.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/93774253092.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1aacdabba---pegumuzapovuwixodagipi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/puwoxegovegino.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/ripolesimedotus.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/jizupatoxisatulomofem.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/27666670240.pdfIn PDF document text
    • http://kaies.cn/upfiles/210725105914601617wfdk8z.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/59460196259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=master+songs+download+ringtonePDF 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 10500 bytes
SHA-256: 52d5f3ff6dbed0b0bec6e58ba8fd893472abab4a2fcb0cc75c4f56ccac5f9336
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16368 bytes
SHA-256: f054a7df2a59619b073eb28fde9c78dad9146e3d41ed8d87d6504efe21d53363

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