Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65a0c8cfd1c06dd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 08:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db244db5fcff6c5dd32786c1973bdae1 SHA-1: cfbc9bdab256f05e6563558d35ead5e7c586e2e8 SHA-256: e65a0c8cfd1c06dd52918b14068dd0020aeeee1954f7320fe9c4707d4611407b
176 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. It contains numerous external URIs and link farms pointing to various domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bbpartner.cz/userfiles/file/zemudixogi.pdf In PDF document text
    • http://maroba-zirndorf.de/file/siloxezit.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/jifivog.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/21658014930.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/riwenozanuru.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246efd1386.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7698c26cb1---86228129401.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/seluv.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160be310ab3a14---2806727337.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/93567515344.pdfPDF link annotation
    • http://brmhn.com/userfiles/file/20210816191335_8lp2x8.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/746c59570fef4b494f592abc29fb7058/gixerusotofaf.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604084801837075.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b105cf428---gabusutuvegofunotu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k20od6i38g6ikoi23hqk8u8br1/mubago.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ea8f1b77---kukerodozujewabavafubel.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/mupokudejo.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wapedakinapudana.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82449640742.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/68022222906.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/wopakajilajanoxewew.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f9644545785---zabaminebepupik.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/af4e35853bd386ed5ea71b87ed5218aa/xepefatijulewul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+sa+cheat+codes+pdf+downloadPDF 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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 18312 bytes
SHA-256: 5da0d4fb2d041767e21f321c188f5894de75224baaab0103d32986b8ddaaaa48
font_01_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 10652 bytes
SHA-256: 150d68b67dc591225142c97794a8e065f56959adf6b489d401bfd00e41ccd851

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