Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e5d44f89970ce2…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 04:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cd04a98f8853a283c728cb7eeabff7c SHA-1: f999295aaafc3e31c4d063259ad6051128bbaa89 SHA-256: 41e5d44f89970ce2bd1e7f765116964afdfb8be32a3c86c415dbbfb23fbea65f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.sport-konyv.hu/userfiles/file/fuvamepajobamasuliragipo.pdf In PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/17780783123.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/ximezorugumeboxoruju.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2070ebbde7e0b66554eb967809d5ef4b/85240615825.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wusewewirevamizena.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zenupituto.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/52847341226.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5972e714b---jaroderovamilupewobafipu.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/juzebededetomolawijavere.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/mitaponekavuxigu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/30429571178.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/57981843579.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160972e1a27f33---pizobotipuvizore.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c1t5fu209a3cgffmokc8fdhog5/lunamukenepano.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xijazamajopamurusutijoka.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bed02654b---bijedadavageweg.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/71232398413.pdfIn PDF document text
    • https://cmoretv.com/userfiles/rurajodarebolar.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071700e0b313---8700770112.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/872c016d8d07743cd651201db1512b4b/zibomemidejipapufu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/05fe54bd56bb9d5e3c0915dea8c72d0f/xetazenalufuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+super+mario+64+rom+hackPDF 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 18696 bytes
SHA-256: 8980f60a9b517356b50046dc7a41c6c0c9eda15ccf2e7ec16a9520c6f8a51504
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 11004 bytes
SHA-256: 55f5c0ff26ce08fa962741e2ced24f16fee0e8601b4f08458caea06239cdfa99
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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