Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b9e8e9c22ce3f1…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 04:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d09bcfc329f35282f415e63cbf3b3983 SHA-1: 1c9e0b547e814ca91314a6b5ec11c810fcf89ea3 SHA-256: d8b9e8e9c22ce3f1a065c3c5ed623d2e6405005fe57895ed1baaaadb320be036
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or malware delivery. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3798

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=executive+summary+research+proposal+example PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44416a97b4---sexusel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/41255600461.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/506808bd8a449605927b303375a81459/6147155571.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/toxetarage.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/8ci9plf00cpt91f6mobo22d48s/23230917962.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4dfe804eb0464b1c04ecde9bb413b093/51674531327.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607145510bfac---33824402166.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/76348152638.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0149176ad794e8c51700ca6d90a6b3d7/gebipedejumuxupevuvof.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/30509553869.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/worabomejaguvufokokas.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/raripebikitiwuz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c592aadfed3---30305689566.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/75a7d895ddd6efc5281c5571411337c8/25814866314.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vufax.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4e671a88e150cea1152d544b8cec4890/kojuvopitigezisigo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tumulazip.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb8ecbe59---987043194.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/xikofarusovatifomoku.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecadb15111---29859379500.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vijenulalezadokoxefatamu.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/juwajubavu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ph4il1mho6ttr61ool95iq0f4v/74729992694.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c611a1a20---77506060731.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f918f0ba1904b3303dc704601dedba45/25512766235.pdfIn 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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10900 bytes
SHA-256: f23fd857b5127d921ec2fe8c501984c4e4605aebf6506deb979ae418cf54d4a2
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16568 bytes
SHA-256: 18f6ac4d73c8e07f13cb62deb3cc6d8235ccccb46fdac7a5109afc7dbe706ae5

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