Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9dc0248a793925…

MALICIOUS

PDF

80.8 KB Created: 2021-08-27 19:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: acb765f4cd768119ea1066ffd2d0bda0 SHA-1: f20f945369bef1b9a342b1a73f5c79699ced480b SHA-256: bd9dc0248a793925cc64069fd7313ca2cd6c605cc82f56c5a397c78f1d245a07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allcreaturesinc.com/files/files/mepawejimujelenubolopepu.pdf In PDF document text
    • http://abwrichmond.com/uploads/files/rumasetopapapejivawagor.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/konerabomezepezil.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210810_B3293544B676CED5.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/81575249671.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zebuvawizafoxeziz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/cecf833e0b382cb2458e4cb82cae59d1/detifof.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121155873460---biritatoxudajiresaw.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/levewepoterimalut.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/vixarit.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/74956403910.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/lilijofef.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/p2sbni0refbi0fvvom64gjjsr7/sowazinewatanatoxeditibu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/paripojinivodobupa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c91160dea86dee0f387bccac0f322fa2/38096957138.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/63967115797.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819752c3559---62106606413.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/38833457607.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea41710106---mamegadukofuv.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/40730120048.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/dadumikifan.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/600577d7b0f014a3779b52565f0eba42/45563924686.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/delomagalazikude.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dutubifamopiperebefudulo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a7047a08f---340196870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reverse+and+thrust+faultsPDF 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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10448 bytes
SHA-256: 1158f806369d2b8571edada781ca4bd15d3c600f7b64ddbd3d6509dab5721577
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 17584 bytes
SHA-256: 0aa9685789332679a2b9e1a0afce2ff58fea5be04de61e8f2760ec27bf432a34
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1