Malicious PDF — malware analysis report

Static analysis result for SHA-256 509b574ad3c83441…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 18:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb828b645c4f2f586549332235cd999c SHA-1: 652c931df1a677a3e61687770dee1dd855f4a042 SHA-256: 509b574ad3c834417091ddc96ee81b180a3268c2e6631c71a5a54cb15f56c080
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://rockbond-aac.com/id-admin/fckImages/file/13202612582.pdf In PDF document text
    • http://tamlaproject.com/userData/board/file/kigadixonipetuv.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wojivul.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xusudewumakutigaleditowo.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/mulamanubuv.pdfIn PDF document text
    • http://gibisch.com/files/files/noworipabuk.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109082248254246.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/ruxokuto.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/85761727010.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71e4f16e---jojezixuwunowi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f034bdd1d1---66398019443.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/79338127269.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142bfaa9c246---vawudutinezaw.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/rululakelitufadofijafete.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/58987706222.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613067948fc68---44164884565.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210907_B860DFD8286DD568.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/69568099427.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/fivobuzu.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gafenasijuzulitegafeno.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/tetemalamekosogug.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/fuwotoxesudir.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/texajatekova.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/79264408414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=why+is+my+phone+ram+usage+so+highPDF 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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10764 bytes
SHA-256: b7d7ff222783c1250db356223b9167288c9f44fe26a35198452b537357c92741
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 18140 bytes
SHA-256: 783decb76403e939f456db34974bda898ccd4019bdb6d5d574a088ac9f2d66ed