Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee38df97133afef…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 22:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84da68875aa463c2bb67b4408cc4d810 SHA-1: 37bf953f507c71effbc3c6008ce528d38250653d SHA-256: eee38df97133afef0eb240c5ddc7580e0f635261aebaf9063209ad487aad9189
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=minecraft+bedrock+edition+download+free+android
    • http://a-b-i-s.net/layout/bilder/file/pafegorinarezarome.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/34831064500.pdf
    • http://studiolaviano.it/userfiles/files/58447346530.pdf
    • http://mecaniquekd.ca/upload/file/gunolusidenewupe.pdf
    • http://rdmsrl.it/userfiles/files/bewuvodozo.pdf
    • http://streathamtaxi.com/survey/userfiles/files/potoludujukakudoludidiwik.pdf
    • https://cochleartudaskozpont.hu/files/ledowigaxo.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/5854488715.pdf
    • http://ministryofrum.com/memlogos/file/26399335925.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418df716d3d---54671745026.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/39995866324.pdf
    • https://eminentland.com/admin/userfiles/files/64891927260.pdf
    • http://abc-tel.ru/data/File/mirumamuzofubexapupugup.pdf
    • https://superpart.com/files/wupeguvo.pdf
    • http://marasintl.com/public/ckfinderuploads/files/4272351519.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/c0ai5drpl3tbar8im4vojbvfrm/xajumo.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_044729.pdf
    • http://tcgardening.com/userfiles/file/2021091610463773499.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6d5e5c6c---zowezozedasuzugofupuzaz.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/vamavagigakumafameb.pdf
    • http://changrung.com/ckfinder/userfiles/files/90576314161.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378e305ea54---25685727764.pdf
    • http://bjyhyy.cn/filespath/files/20210903074749.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9eb3a4b98542bad4de7c9141fd57033/kinewuka.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf07ae66b---govonegupoduzuguxu.pdf
    • https://branchennachweis.eu/userfiles/file/33255355591.pdf
    • http://indigobaby.eu/upload/files/61327301263.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbf.bin
f0889555ad1d7be705993b24712c96e82ba58a027d831ab91e6cdc752274bb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 18948 bytes
font_01_sfnt_off00010fde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
font_02_sfnt_off000127f5.bin
a2d1bb74315a73fc7178cbcfc54c22444ab7ddc3dc09359276c6b27173c8f41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 10612 bytes

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