Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee02cb1238da6e44…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 10:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a0cf22fe4ebc1cd4b2e7a45bd053295 SHA-1: 42d7e36b0ac52e5f9a1e003b6a2b12de8eebee5f SHA-256: ee02cb1238da6e442e56c5764f62488a42caf798a1628be2a645b911b5c8ca6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=vpn+mod+cracked+apk PDF link annotation
    • https://szabobuszberles.hu/files/files/wafir.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/71433381108.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/vuzizovitagugine.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cb470fae694c57c72b4398c89a21d51b/vovadewo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1a745c3---tosiditazejose.pdfIn PDF document text
    • http://dogable.de/userfiles/file/18949387900.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbcf1de47---19047480700.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bibigogaxogo.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pevubeg.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nijugekubejowareli.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/43e49eeb4e63c13b9a04356eaa506966/rokefivurobu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/60586814895.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910171808.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/93410967250.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/79231028048.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/86895912865.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/kufodolipibupixijinobimuv.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/zorejikonobozoto.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/lerewusebotabi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303234c0ba0---91155804609.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/48087063749.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/92974618471.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/19000149320.pdfIn PDF document text
    • 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_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 15116 bytes
SHA-256: 0990a58800502e9b510bf189ec171fbdea28c8bb7168218647f76ba113b97a26
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10332 bytes
SHA-256: f416beb0898b28b5390086722a2fe4bc75aceaae1bb7c14c8cdc021caf2cc885

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