Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f76a0fc60dd5646…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 13:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff4b46d7bd67631fdff3450483841477 SHA-1: d677b86dd22459e5010d9b98b7ba44f0ab7a3403 SHA-256: 1f76a0fc60dd5646bd335114f1143734cf71df390604a292d818186460dd12d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://montaze.org/democms/userfiles/file/78620348079.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/89472319645.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52df9d11f1---sisojuka.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/nalabopevitukuramuratix.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/podimitexelokozabetoza.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160debf8da09ac---gosaluzanapodozibof.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/vonexivivigid.pdfIn PDF document text
    • https://exxontel.com/file/fevutokewimutuwakedifot.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf434347e1---niwovimusomusudade.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/newigozemetatasudo.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/37244769667.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45292e0432---98292349681.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/00f4bdb075af76893f4879753df0e79d/396524088.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/32953306777.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/xolujurijawilegu.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/74536700314.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/zulezosefeforisibozu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d7d016708d85830d00b6a6cd52d4e992/kovakizobubuxivizis.pdfIn PDF document text
    • https://ancoraeducacion.com/images/93263189446.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3aabdde0db8b1fc67713467b7827f423/48421793579.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/24485471402.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0ph2ouaf0f6o2mrrq5ce714jt8/53432058144.pdfIn PDF document text
    • http://zamgph.com/uploads/file/242137183180.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zusojivatenavu.pdfIn PDF document text
    • http://flexicourse.cz/res/file/47468822725.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/jekigenemad.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/sunuweveramemiwevukabifid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=treasure+island+worksheets+ks2PDF 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_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 10708 bytes
SHA-256: 89054395bea55f02a832314132f9ae530baf69c97b2edc115f07fccc824826fc
font_01_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 17572 bytes
SHA-256: 39458cdeacc3b6d96b48ab9d7ee376955645ab7a6b5e65ef99dbf81416444423

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