Malicious PDF — malware analysis report

Static analysis result for SHA-256 487a843a232544f7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 20:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f8141f17aea3ef60add047b3e63039d SHA-1: 9085c2c02677185e60dde92da20bc9f2ad8dfaff SHA-256: 487a843a232544f7a5b8a4af271d8ad6db7d97af27876da0134897a518352ad7
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and the overall structure strongly suggest this PDF is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/pizatuwatibowowetod.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/54653494955.pdfIn PDF document text
    • http://hidramaco.com/files/files/rumigezupirigikodiso.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148708639708---sunerixefewo.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/34201048580.pdfIn PDF document text
    • https://petek.biz/resimler/files/3248640511.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zapiwumerom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4eb47710f5855b8ef77932c0a0ea5d73/40343188921.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e55b60e86e2b28e8e697359e2c01360c/49218436708.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7a5182fc1e13ea9abe0d1ee9705ce087/61272122231.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/18261460652.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/tanivovi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/92510951326.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa3dd03cf---gepuwuliguba.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/10326940159.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/36921564466.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/41233249689.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/mebizetuwivamurireja.pdfIn PDF document text
    • http://congluc.com/upload/files/rudexukaberitavijifusetud.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/52500986882.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b9ad20c91a85968f88ff834c34ea9/lawud.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147db2026965---menojidegumedagelibar.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fab0efacba9eab8f12f5219a422a7eec/ravivodinuzopegukulibuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hk+dass+engineering+mathematicsPDF 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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 17212 bytes
SHA-256: d5a645a0bca6b7cc9e0cb4b0d45d324662268bec58fe494eee156642980647b7
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 10736 bytes
SHA-256: a3c249f4080a915644e82e83347809db13bea718eeac9cfa9f62c54a82d29d13

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