Malicious PDF — malware analysis report

Static analysis result for SHA-256 9526a04fed8dbea2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 14:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32beb784568ae07d1f9cb9c29b04774c SHA-1: ee4eba09802237ccd77ade23601a0f3e59399793 SHA-256: 9526a04fed8dbea2d699f33f7627dcd573e3317d4e42156e5516e4b9c11f968a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://rsst77.ru/upload/files/jenaxa.pdf In PDF document text
    • https://juraganmonyet.com/contents/files/44620354075.pdfIn PDF document text
    • http://all-premium.com/user_file/files/14966410510.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c3ru97g6g8kfm62ujsb1oufk65/22066127062.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_255A2ABB85F12BD7.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4859195576.pdfIn PDF document text
    • http://mobilenmr.com/files/files/kudunusagizowep.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/nonewenusotekomuzi.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/3279623496.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/risutadef.pdfIn PDF document text
    • http://konberdbio.com/upload/files/10003592690.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8f430eb6---nexuper.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/39930646907.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/2972598833.pdfIn PDF document text
    • http://seto.cz/uploads/48423021830.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/30878620529.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xasavanuxegaramamulanoxas.pdfIn PDF document text
    • https://fishboat.hr/files/rezikotepoxepesafuripuj.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/pegozufa.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/2344624375.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/96543605337.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d30b3d53---85984085377.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/29979357959.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f777e0c999---76211287702.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/62435130891.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/samifovosizadi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/tukumutiviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+change+the+location+in+play+storePDF 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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 10844 bytes
SHA-256: 1e5d06d73b069efcf0e7cdcc0c1e782b3dc87b3abd0d5eacdfbe9305eadfc964
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 17944 bytes
SHA-256: 5de807063004acd38fb064b12cca23a21af6b0b19f5d87feb7be34a7293dca0b
font_02_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1