Malicious PDF — malware analysis report

Static analysis result for SHA-256 666da2f1b5f37d88…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 15:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16d9c75f2e432d41b7ca40c5e771ea1a SHA-1: f6cdc5c72db9466295afe447c81556ecca223ce7 SHA-256: 666da2f1b5f37d88b27801ddd0ac2b5388f15adf8bbbb55e40d93876d00a2e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.bevillelecomte.com/ckfinder/userfiles/files/87016847327.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0213bc72---65196431550.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/gimodipudogumipot.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/39539464654.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/69703436444.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/tapuxiwubuparuzis.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/22601639554.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/mineriloniwavurisepene.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46e859ab7ed7f6050842e62adbbf16ca/piwefozigasijutaxixiwu.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910105232.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f282c36030---vijuneragoti.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/popokifafarukoxolerimima.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wojiwezutojagi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/zemaxojefawonidepaxiwi.pdfIn PDF document text
    • https://telenovella-bg.com/files/49684572703.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/36507406226.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/89628921666.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/zabekaraxowagezegovutijem.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/19075119371.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/rotusut.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/98805986603.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5722222c---52856686024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+color+by+numberPDF 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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10568 bytes
SHA-256: 843771e7ed64c85652e88f18d783650bfe6e9fbe38d5a1b820f62762c44ed01a
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 17888 bytes
SHA-256: 25695aee14a7c7e395d36ab6313cfa262cf9902e400686d03a4a958795cd7812

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