Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d594ddc2fc684d1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 20:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d0a44a0da378726c25daa9e4910f183 SHA-1: cee7d3d486dd04261549d997c275231f25f746df SHA-256: 5d594ddc2fc684d164ce157387f661379a7b167a54d0b2ff0a688006beb5ce54
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to deliver a second-stage payload or redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613664bad4a09---11900515202.pdf In PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/57030921309.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b097b8e6---zidatuw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e5c13198---mebidabulazukebenire.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/80530606314.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/jutev.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51458784999.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f97cd4ec18015360f7017b415ec62c65/38258827778.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///fiwix.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kobabezizu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e03ffc8efda8372f1753298262bc1153/8362673296.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/jorepegefivezi.pdfIn PDF document text
    • http://93564497.com/userfiles/panir.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361cc70bed8---xevumowaduxedok.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/pigujasosedadesepitovazav.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/53919053091.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/70958049729.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/tekasepobusaxatirufexemem.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf6d89306---jujuvitagironabejalireg.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109120914289596398wl2if.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/85831926149.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/090008282854.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nubewapazivebixixobiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unlock+android+pattern+lock+with+google+accountPDF 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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 18384 bytes
SHA-256: 550dfe1dca6ff471f080f2bb28b26a5af96b67d2ba6b0f6850f35dfe72473146
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 10892 bytes
SHA-256: c6a4df9a1b674ee84c356e321dc23e576432f22198e6cd2ddfd775ad37f84353
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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