Malicious PDF — malware analysis report

Static analysis result for SHA-256 406357a386cbc988…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 23:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c369b650ae7195ca8cae7ea85a2a048 SHA-1: e6e14025ce2409568659c6e7ef0fc96e71573333 SHA-256: 406357a386cbc988ade469fadb4689b07a1e4b706e7cc6b923fca184489d3eb0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support the attack pattern of a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.comperat-89.fr/ckfinder/userfiles/files/zezogo.pdf In PDF document text
    • http://usarsenal.it/userfiles/files/37254231046.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/dojopatejides.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/99890277167.pdfIn PDF document text
    • https://sharenkon.com/files/31836374142.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/wivigigenoxugumizasim.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901192646277627xfp6wgwww05z.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/kegapasovizobitafetabaz.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wofasol.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/10047486771.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/17641601751.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fcf823954ed682acdac23c8e0b8f7c96/lipidulim.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e55da8d1---10123540329.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/63693394457.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/88035195789.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wonefidemefi.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/febizupedevujibevarud.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/vilidopavikonipo.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/borepaxokomod.pdfIn PDF document text
    • http://agrion.org/upload/fichier/75722468859.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/zadazidin.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613D01DFCC730.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/purelibukiviwunef.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebc445405---xowilumelimo.pdfIn PDF document text
    • http://ud2-140.com/files/giwikefunutilezapesefe.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tadofumivasugevogukodar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=marvel+games+for+android+apkPDF 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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10896 bytes
SHA-256: 743b109d0f89f64cc40b4ef7c80f6a59085e69e3287835a9508fc6a222d925ea
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 18972 bytes
SHA-256: 62de3b20dc588209bcf12d6af2649b3b0cefa13c5f9ddfa44802cf7b62b329c7
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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