Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c059d9278b7821a…

MALICIOUS

PDF

91.2 KB Created: 2021-07-15 11:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 044131aa7263b30f77c606631197475e SHA-1: 014e6b6013b295356bbd418fd9d7ac84b315ca43 SHA-256: 7c059d9278b7821a3bcc6a36c4ab26880ff727eb28a3f37a26928921cd6b81e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the final destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=fallout+shelter+mod+apk+unlimited+everything PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6245642a3e---mivaluzud.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc08d94363---11484049705.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/wuvojudopa.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/pufuxisaxajeguvaf.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///ladebewojezabe.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210610172955_1362541760.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/lubapepawezuto.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/17073539352.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/waxovikezekixesodupejeb.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kubusosanirum.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fjml3go71rud8jri3seluedj45/42442986920.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe976cddd---vadizex.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/832b09c784e691973a0376557592b413/72952783093.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/79528611766.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/18577695361.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wujabakekafubijek.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/4744480487.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641e1c358---pogibepitimanumotemusulu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5d7366db---42676185743.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/66434bf8cf462fe551c85ea88c119282/95966757750.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gq9s0h75vsi5bgp1b58vuoud1n/76273637565.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/meleragugobelom.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae290532357---38972156908.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d44ee2ab2---joreralaladop.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaa259eb0---nivemuxanuzuxagopemi.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_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 11188 bytes
SHA-256: 78ed7578b75fbcb56d5eac55b730f098b9ca409ca3b3b1c9e882951c31c051c1
font_01_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 17272 bytes
SHA-256: 03415f79b9a8f90c010115faa3800fdfa9dafd56cf43b10e72ea7814633d59aa
font_02_sfnt_off0001471a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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