Malicious PDF — malware analysis report

Static analysis result for SHA-256 421f30dc69349824…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 13:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9d5eda4c88024cd3c91a5c2dca2ddf3 SHA-1: be37fbbc4e38860c9979a58fefd9b50c8f234c6a SHA-256: 421f30dc6934982409fdad990578a22a31d9d5b58900feb2da7f7bf5970ebd56
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers and redirecting users to malicious sites. The heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute phishing lures or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3594450e35---xelosofapotimopamukad.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/56473141180.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0b36mo7o859kit2v9i7cjq20c0/kuroximunegexarire.pdf
    • http://massageindex.nl/images/uploads/74915905182.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qbaco5e4vso29o4diolfvafv99/97290199926.pdf
    • http://usmleworkout.com/files/file/62961361095.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f525002029cb86d60065081ba9c0dc73/78089271865.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e84b8ee5---5829424795.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/236165c20ce533ed682beff3de7ca14c/momigenolezedoduf.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f571f41375---bopalekonelavil.pdf
    • http://smitheaster.org/clients/861344/File/xobepipugaxixemukanu.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebdd800f95---wofekepowuzesesurirexobop.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/27200902460.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b03d6e99---gudepomitese.pdf
    • http://beveragesgs.com/userfiles/file/65278163056.pdf
    • https://royal-art.pl/uploads/userfiles/files/54571153417.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/efl4a3is19s30uh3nr12cmucn4/56041095554.pdf
    • http://englandmatchshirts.com/assets/file/1584514879.pdf
    • http://4998horo.gmmwireless.com/contents/files/situwinime.pdf
    • http://n-production.com/upload/fckeditor/file/jegosuxo.pdf
    • https://candbco.com/ckfinder/userfiles/files/4100843068.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bd7487429---87623966529.pdf
    • http://kowel.com/ckfinder/userfiles/files/1622502521.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97d24dfad---dikekufezatuken.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070faab87799---jilasat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=waltz+of+the+flowers+in+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 16792 bytes
font_01_sfnt_off000111c9.bin
e5798a830a317e1e8b7ee29604e76f1e7af1f31b55653d67ac5a0cb2bee631b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10684 bytes
font_02_sfnt_off00012a32.bin
018c675657f97bea2f67c4e89699b64ccb911df064c93ef33594e66ed5baf548
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 18372 bytes