Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d9a4a1bf1813e2…

MALICIOUS

PDF

72.5 KB Created: 2021-07-16 19:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 863f2ef7c0c2d5736d3ab4f28e54d1b5 SHA-1: a1c38abf6cfbcb813d299b1773e651e7e3f0a5d2 SHA-256: 19d9a4a1bf1813e24436e8677b1ef3b8480487f78c7bd3d35158db0308a5713a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded links likely serve to redirect users to download further malicious content.

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 http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dff5e456a---59360933038.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad679fd8e13---50377153102.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rexudigojabevanujisaweki.pdfIn PDF document text
    • http://learningkey.org/userfiles/tebase.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/uumvfchro9mru5mk6o6ujuas67/13813205408.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tajijiba.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f536a554---nalelimamovaledipugena.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/mhhehr819ro5ne7crcucec17g4/dazikafurujinufotite.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/93073050041.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mtlj4e3hflgip5hu0f1d2iohnk/musijamerasexupatusugawon.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/guwifu.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/sulerowam.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899c14c811---guxoluwevenubi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/boladadumegevevuxesapikiz.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/dagazajanugoxu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/lokubik.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c385f247f4---45701733668.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ll8p46nikffrn01vg8quqspms6/dusisogu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/77753180189.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/59864219230.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/9499353561.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3b6d02eb03ef1564d0ac83532f4c6cfd/82087684232.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/63422639827.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/32a08954a1f9c71f175f1c991212c5b1/xuwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sample+pastor+employment+contractPDF 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_off0000ba18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA18 10632 bytes
SHA-256: aeaf8a6ccce98ed3e068d58035e1f3cf469776a8e4acdd8482c6082615ddc1f6
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 16264 bytes
SHA-256: 6b26aa327549593560c15eaa3c28e1f12f97c13db84e594feb8ad5a02079e27f