Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8a92c6b8073d50…

MALICIOUS

PDF

87.3 KB Created: 2021-08-22 00:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e46a879e01cec29e80103adc914535a4 SHA-1: 7206e7a5173a04490c106672c163d0197ad40a2b SHA-256: bc8a92c6b8073d50d1d4e25ecf32db86d2c7127fa62d5f7ce096bfd8fa20f1e2
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 domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. The presence of multiple links on potentially untrustworthy domains suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/74643529547.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cf0291f1---lulisegipupirokomavuvo.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/51987322797.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tonugufuxadi.pdfIn PDF document text
    • http://industra.sk/userfiles/file/2850989385.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6a5824338397be7031aeada6f85e2104/70576199921.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a1bdd05d1---juxekepadakal.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/48620409584.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/4830727215.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75ab02f977---polegopugipezurizovotep.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa783dc17---1629082809.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///57140560662.pdfIn PDF document text
    • http://scro.ru/pic/file/42520224453.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/gudiwovo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c10d50aa---85823910903.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b865b0af9ba---rilidapuw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7va8u7u1ag7asrc5svhl2aktf0/lijifudevefefuwow.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kojafipav.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/jawaluwupaduzux.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/97451914351.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/piwakig.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/goxuzeridazawowiluwezo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vt86qh4gkte2jvsn2dgthgfevt/gaziwawotolavurilafe.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/34098080576.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6f2c7b8e47afb20211dedab27568cddb/78261542481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=metodo+aquileo+para+aprender+a+leerPDF 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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 17716 bytes
SHA-256: 1be3b5467f854dd08b8456000a7d1f5ef189bedd8a5e7117a4c449933f32a64f
font_01_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 10456 bytes
SHA-256: 8fbb8cb270f7ba80f648209cb3f979a5de42007fbce210e486837485c802b5d3