Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51e64975075c408…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 19:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4ede2b485ee0253fd97ebc7cabe2981 SHA-1: 66c7a4b4bd5cf555b92db21d68ffc3573af7eeec SHA-256: d51e64975075c408ae3e426418172a0f4d77b7b48b63b11a1277e01766b60960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=differences+between+animal+farm+book+and+movie PDF link annotation
    • http://aylincinarli.com/fckfiles/file/jekuluvudux.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ade43ee0ab80b50c9a3de592a8ab6443/befubofevevajuleneg.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/6t14osrttfh37cof47g5mfd4er/nimusam.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/44cf9a5e5949e0d151168da61c29a274/59683839646.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/muponexo.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/6044563184.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3a4bbf2a---roreg.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/06149196370d6de5acacb2228a2c4c91/vimeziwiludijitazi.pdfIn PDF document text
    • http://www.buildonhope.org/file/46227112351.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/felulekofoxedezuked.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/midunegisevemiku.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/lmsdnr2kekeupvk8aumtf0h7sq/memivowob.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/fezomizejibob.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/866a60bdc9c4656f6cf85d3750b2b845/22140096521.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/58435398527.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mutivabemepajobugeza.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lfjkbo3vr1ubnch6gidro0j9ch/davez.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d315b6b5e---90026294767.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3eee0703---50338315689.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/57356295573.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b280b720ba76f6917876c561cb1737e3/tozepe.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/53626085398.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/21968030933.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ac217b7c822---11241343948.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 11024 bytes
SHA-256: c5a0bfac22e48ddb1e4e609b99129885a1bda23f9b577122340e487d6928cfb5
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 16992 bytes
SHA-256: e8bde1769bdebf0b3d1dcc3d2dc26bdf4c064a75867baff8eadca100d3ce4d0e
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1