Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c2f04c7365fea9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 09:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da0f618f3ffa192de48057995d1448e4 SHA-1: 58e070ca7f02ae07e5a00fdfef876d747474e624 SHA-256: a6c2f04c7365fea9be66d23bea707d94706379fd8795ed8dc29819afcdb6e99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://daydreamspin.com/userfiles/file/9154817193.pdf In PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/11496969140.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/172dc794da06e705cb41036d1e13ad4e/rekolidirakupike.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079feed23cdc---16065724352.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42656727156.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/70957452926.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6378aec7e0d38c0af1a4b0d600c24def/95077601581.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/eb56518bfd1e8a45b834f35776605a8c/vemiramewa.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/86a62b521c30354720cd2fc0676d33ec/33246741601.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/batolorunanebeb.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd9849844---bategamimowugivesobo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/taeeqog69is5leue8ntc0f9fvi/lewizidesezopijesoxu.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/mutire.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/22285052018.pdfIn PDF document text
    • http://kezmosas.hu/files/file/basovurotake.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/sofilurow.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/juniloropi.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/210728023050521501mkk7hl0kpbec.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a862c14ef6daebac89a069f544e27f7b/96646473031.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde46a8dba---44784928901.pdfIn PDF document text
    • http://boldogelet.hu/media/pilasorul.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/naretuwifog.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/besiraparekuwapojebufi.pdfIn PDF document text
    • https://5uempat.com/contents//files/dipevozonedujurojili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tecido+epitelial+exercicios+pdfPDF 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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 17200 bytes
SHA-256: d114d5dce42c8348d0c352c25b4dafad740894aed0eaabcebc73f8d27320c674
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10576 bytes
SHA-256: edb902ae1153b42681b1f11df4cbc16fbf159f734f0d807835d9bc1b84da347d
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1