Malicious PDF — malware analysis report

Static analysis result for SHA-256 249188d6f80f4bc8…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 21:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 26beb2960ce4e328b570a8e1c0a26093 SHA-1: 228ae972bca4fe8ee73bd9bdbfa4b832bd80c4ae SHA-256: 249188d6f80f4bc8bfb94f910e79a3aa96c6d78ecd11db2a0fc345e0b7a697df
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and the detection of a 'compromised CMS upload link farm' heuristic strongly indicate a malicious intent to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16ff8a69c---xujixapazexefakamadure.pdf In PDF document text
    • https://rajaunited.com/contents//files/fudepijekab.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kibekuvuwox.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/18851732074.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3agdh8q30j7vhl31m9jtis0c03/78991190535.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/485181bb2c78eae05a7ebff3350262d0/nuridufuxiko.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/89770343747.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1uqui2b17pdeighkjj11ju3af2/rubusanipisitinosawa.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/43837286741.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/12740967917.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdb452091---39713879376.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f5a3952e---63609528949.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/21314282223.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09e37cfed---69908913605.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qrgf872n3e6efirbi1pnofbe9g/29263901008.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/lusakejiwob.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/buzina.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/xezorebuberabenuloruvul.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96dfc696f7---zojinudufoxasaguvoxosula.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab232e75a---xiwekedelatiri.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad6146f8ae---31383852906.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ff2f3df---51879854255.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb5041f52---69680793825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nauseous+after+eating+and+diarrheaPDF 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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 10664 bytes
SHA-256: e62d2509a73f5f0f7af2a96c9cf8b5fd2d9e6334fdcb15ddc1b4de360cc68bfb
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 17404 bytes
SHA-256: 9e9f929ef855aa434141df6a4f745876d009c8025043ec4abe2f078869eb3aed
font_02_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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