Malicious PDF — malware analysis report

Static analysis result for SHA-256 b332479d97c469f8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 15:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d75a2d5ee7fcb4a0677a431019979500 SHA-1: 5ff888ede46ea092e1eb5ef6dccbc3dc10de6ee0 SHA-256: b332479d97c469f8d39b3f8da6b947df2480c1187fe096f19b0368ca0d806af5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419de9e2e2---pujuselovotudawexubokoj.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46200c5ab---pujufabuzamiguxawolara.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/37729821862.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109010902476026.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/51106964680.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/modosaririsisibilowu.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/55129393393.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/53365323806.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912f945621---gudumewabajinizafetukej.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/dogumufagazeruto.pdfIn PDF document text
    • http://sergeybazarov.ru/file/sefuwemazubaladizur.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/tiduzazenitetesapupesira.pdfIn PDF document text
    • https://campermagazine.tv/public/file/joxesil.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/biseb.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/17329496408.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/12622902308.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vitazi.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/77708640684.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/75008050368.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2979d47f---sekadexopibiluxabi.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/titurodajizuru.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdb999e04---fuwapoxavud.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pajapusikaraviwo.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/wuxisigan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=c+programs+for+interview+with+solutions+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 18592 bytes
SHA-256: a4dadcdec6a516f8ce72d8f8f09e11cd2c7c8e936ac75eb87ae1197d8faf968b
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11228 bytes
SHA-256: a173cf18af28bc01ec652bffc0f9140d91aafa5f61be9f7d969f3d87be0d731a
font_02_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1