Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1faf50492687c39…

MALICIOUS

PDF

84.5 KB Created: 2021-07-23 15:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a01d895c6a8bdc1377fdfba687b0a60b SHA-1: 33475db999b4b4612eac3154ebc47e40c13b7906 SHA-256: c1faf50492687c3987607786091dbf64f17c6e83c832255a2dbff469d030f658
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/99402878604.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738c858ce33---pamonafegafovujo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094af8924f0d---95887535086.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f7d9188c40c658ed3e5f6853632787a8/botif.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/q2ugbl5aajgpm7qoqugtsrr5ae/mevuredubolafiriw.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fed5fb24---14762910238.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210721_062216.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/sobobipuf.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23360456687.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ggdera8el4sck0muns70kn7lf0/41781716209.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106210843531824.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/40150166877c5a95a65dbd280c1ca2e4/zadate.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xisiluzitiwogemuvag.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eb3d101c36e9a1b09af2b09d2b57d233/96625674643.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h0b33mjmjf0e6s96nlrk4qrj04/vitaxavatazezugas.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/poseles.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/67471864466.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/faa66f6abf197ca8f7b042e60f79e2d1/62096052568.pdfIn PDF document text
    • http://absigorta.com/E/file/85987521836.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/188868396.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38df8bd4c7---71268053434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vellipoke+vellipoke+telugu+mp3+song+free+downloadPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 11328 bytes
SHA-256: fb9197b35c30991d1cf439509764447f83c99974a67bfc7c91460b8e0bd41ce8
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 17672 bytes
SHA-256: c17a0cb22d0ed0ac76f9abbf78cf5a7cf3d4425be2af7339fd0f59178a394a31
font_02_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1