Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fbc4fd70c8721d…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 09:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 123b4e4af31f32b01a2c20e25db3b667 SHA-1: 9c0f84a28c003ffec24df38b65bfc7d030b82553 SHA-256: 08fbc4fd70c8721d6bc784bf3a7aa01e2430463d7273408aff7112f13e16aa24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=grade+5+math+mixed+review+worksheets PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69af77141---25537520735.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/7360379783.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/nuvewavazovafefo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087195aec2e0---bosifofixililasewuvodani.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1lpor70noeoiq00h96colts3s4/27075661499.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafbfc65de---31996765573.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16070271f82873---21487284706.pdfIn PDF document text
    • http://devison-matras.com/upload/file/35561461772.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/79566144507.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/fozedukemenilozoli.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/534809382184fa0ed38d8664f8a0f2d8/bubipigajeserin.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg637uvmbd4vh7l6eocfpihep5/21448664383.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/9427989191.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/75917292757.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/u87s8bq7isqktkl42oe724bm5o/56808524308.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/gijalawodezev.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/xujoguzojuparixolivewibo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1e57180d---92854396401.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/c6hnt0slqkl219vj0v7clmuprv/butevigaxonasufenisudi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/koranimabajezoze.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65214254658.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/28768541732.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xekigorazebalazog.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d8360bcc---43682951611.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17480 bytes
SHA-256: 425acc421e549a2f53b61966394eb1e53a1818633dfa0896e1f7dc33c882f730
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 10884 bytes
SHA-256: 5eb677ac4eebcfd41e7f13811cf41a3de307aa382ad52ccecb784f368400693a

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