Malicious PDF — malware analysis report

Static analysis result for SHA-256 019df866d1de4411…

MALICIOUS

PDF

88.0 KB Created: 2021-07-20 13:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d6c80700181ee93c8af29b910e4a1f25 SHA-1: b8a12bce1dd715773204f36cd49124182291b3fb SHA-256: 019df866d1de441182f38302c77e864fd224fc0a655075d504aed366808d8ee5
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS upload directories, a common tactic for distributing phishing pages or malware. The document body is unreadable, but the heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nfrostov.ru/upload/files/regonugovokobazotofew.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/fokamuvipuzowake.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5f1f19d84bab2bef7e8b37a42a6f3892/pesajuzakomu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/49966041164.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/977b86v3bnn8k2hcfo9qsbrd2g/54437288222.pdfIn PDF document text
    • http://liyangah.com/Upload/file/92867949214.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/sexedeli.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/265fc1d504f31c7135290710ecfadc7b/99279309693.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/838fe905bd837317e7cfd4e2a75d0e73/nifepobugudepazijinel.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c5c7a372dd08e06d3238af743970dccd/50518864725.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/utm52nbqf0dqc85m26rl4u8k97/91208425335.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/897b1db00d8b278aa05859c54f523ec0/kesonifika.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f09a1fcb---53262232211.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/75544422530.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/sosibexo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cedb57215---86203783193.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/zugevefoxil.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4971bf5ef1bf2ae384bf21f21a2f269e/78118838397.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48971a418d1c84ce916fe16c2256cfb3/mawoxivolurore.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/pugafunili.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5403805372.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/49043645837.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/nujawugejodedonigew.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/rikebedutijila.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/38866837350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+is+a+lap+pool+in+yardsPDF 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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 16888 bytes
SHA-256: 456622adf1cbd37db7d1abd8deb2a3c9b317849f2a52066d19b1a146a8dc2e37
font_02_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 10528 bytes
SHA-256: 243584e4dccf1ec44888773840489313a354701660d64d961bfa44b9c8cbd03b