Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2a75eef8769243…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 07:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fe5ebb05829a2a871d830f042d7626d SHA-1: f7496429b38518c611655295202c23668c03e273 SHA-256: de2a75eef8769243adc2a1e8b5056087808bb14b49cf403a26ee42811053e071
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sangolongphuong.vn/longphuong/news/files/55621003612.pdf In PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/27607369404.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/43230105830.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/mewododefurigiridolona.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/94369393402.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/toposulefevumofis.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/kifixuwefelimak.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/82216068581.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/9374567292.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/33155042736.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/novevu.pdfIn PDF document text
    • http://uteambio.com/upload/files/36061368273.pdfIn PDF document text
    • http://eva.am/files/96c7cf0b16d7c2da.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i3f5nljgjtjs4a52cblkj2ccak/96737846489.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/xidagemomamiweroz.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bejisizufaliviku.pdfIn PDF document text
    • https://kimcert.net/E/file/nemofopek.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/kexemexuxamagelalavob.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9855c081---dusixexaruderimubi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k9fabk1823m84m4s7rg47ios27/35365363596.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/fawis.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb0eb794b---jekimimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=office+365+activesync+urlPDF 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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10988 bytes
SHA-256: f39d2e3893a8f3f7e3e013baefb2290970af108ad338727bbc989a874d7caa7b
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 17552 bytes
SHA-256: ee39c5bd1739b5d527b07c2bde9ea75eec7f90b39ecf1471704a69bc31a53315