Malicious PDF — malware analysis report

Static analysis result for SHA-256 3012a89b1959e02b…

MALICIOUS

PDF

100.1 KB Created: 2021-07-31 10:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b703c033da369dbc097b5ea4cdb58855 SHA-1: 2bda585e4ee147c441aac240c683a54d0d49ddee SHA-256: 3012a89b1959e02b15759117f57e0bfc91838c805edf57327a78fd7d39793a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f9b46cab---74561214050.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5e8aca4a1770fafbc91c37c43ce035a8/3677836237.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kozat.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/tunipunedut.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/0uj8n2mohojoniodtum52p8vq3/11580194658.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a231ea4e0d5---10684708323.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/rulinadawilulimolotip.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2c8f3740---29035851081.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16102d7752127f---99880031722.pdfIn PDF document text
    • https://melz-feu.ru/upload/sofodopaz.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/262750804.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2gglqeovd96csilo3am47kmes1/davufusijo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e454ced10---vukuro.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/gomisawivijadagoju.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/salubutozagotopexeson.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/44899466437.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/59297783098.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/95d0ae81b0132243fb421fbdcd87a3e4/65122041902.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073edbc74a34---zezepinumurotelatim.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/59197750027.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/071eab8ecb0dc7b35b0d5e8a861b820c/tidivazujireletegotor.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/51d2dd6499abee7503763edf3426b88f/31566605792.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/nodus.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d266776de48d827428298b5e6850ccd2/47608859510.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tr7tkhhiprtrdkvjnbfre92lj4/24768176654.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/donexekonekariga.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093bfb8d9c61---liwakoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+pile+foundationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 18944 bytes
SHA-256: c3c006b4ee3cfd24a658a8b52714255046a5fb3d347dda2b1bcefd48e902885d
font_01_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 10660 bytes
SHA-256: e537416c50a73ac8dc530ad4d0b40f24d821535ee70c68d7ddab6338e83a57c4
font_02_sfnt_off0001543a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543A 16108 bytes
SHA-256: c89ee32484f924dd147b850a24a3beeefdb8a1d955e484275e9e38f3dfd593cd
font_03_sfnt_off0001697f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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