Malicious PDF — malware analysis report

Static analysis result for SHA-256 5397f82e262abfa0…

MALICIOUS

PDF

83.3 KB Created: 2021-08-31 02:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2719030e7c0a048b446b16aeb711509 SHA-1: 7a510cab67a56ee3d246cfd270c32c112ceeb11a SHA-256: 5397f82e262abfa0174230e13b25013ae4651a4877c46f54bc812867037e20d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/uplcv?utm_term=emblem+for+luo+yi PDF link annotation
    • http://veterani-pushkino.ru/userfiles/files/78073221001.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/070075eba97a3d5dde28b7e912ffebce/23530017317.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/gafos.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8bdb2d67---viletegazi.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/jiguxujonufuzum.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/51543834323.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607880411706e---vujolagagilimozip.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082abdf1401c---80122066900.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/93713965799.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608176ed0e09f---gimapavubafawimukog.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabcb37100---20726458300.pdfIn PDF document text
    • http://www.heksan.com.pl/file/luwifexeza.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/686e88d6e515b69f4aef4415d0fd27ec/53613274035.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/jchjtunlamffd5pfc2ono4rp5a/76034555648.pdfIn PDF document text
    • https://gencatakan.com/upload/file/letajutak.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f251f9e283---pevud.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/45471184854.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/xikosozufenige.pdfIn PDF document text
    • http://yongqingtech.com/d/files/15134885950.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cd43621---80466547676.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wixifatafipowetela.pdfIn PDF document text
    • 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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 18048 bytes
SHA-256: a6b436362dbd7e7687a9edae06e20f2b70c949ef3f98c23a2e14736bf21d75ba
font_02_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 10180 bytes
SHA-256: d3dda202ac915943842b2d9b457b7f53b0124e5ab9c2131a10cc71cbb85dffd8

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