Malicious PDF — malware analysis report

Static analysis result for SHA-256 18294a5040dcb2f0…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 14:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8679f73a69ab7259d4ca339dcb8f67dc SHA-1: 9b253bc6012179457be44b47467d7b1819f89594 SHA-256: 18294a5040dcb2f0a1ec72ee79064550641c31ed152ab6e94aadf81cd18030c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a191d9188c5---63034818963.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gorobasuwujajej.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/kebomodixovore.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajemufjsrgglkpgf7qhreebdsn/87947411271.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33e453426---xawatajukanuzidesugena.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c2571dc5aec2e054731bc94422c476a8/85051623090.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f81de1a83---visosi.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/20088212778.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zilupifenugorudif.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d36ab4d639---gipesudulidavipifulude.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/26acba1d74a438e722125ad4ca3fcbe3/zanoxubotazirafokudeba.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5fe383b4---35982383021.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5993fb19c8df48e71e51e5211b4e959b/wisuronazosodorusuneriwiv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d15aedbef---dufuteme.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9jr34ri916gh49tvm7prs9kj8f/65499826276.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/84379005024.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c22c5b0ac8303e49c3ff40c7c83df026/7704965340.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/500306c4824c0d0fc20d47ae5435dbbd/pedojunomuxex.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/5293037099.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/42935602578.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/58563990532.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/75a8b4f4e4f4cd1126e38b2e91edfafa/nejaw.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6fm8e5jj5b5gevbgvpcklokjln/11949328383.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608505bd9d58f---wowogidanerumuwosonuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ing+and+infinitive+verb+patternsPDF 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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10664 bytes
SHA-256: 970019779239cd6b58606f682e625632c0764d57c0dea03855ed59f027338e39
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 17872 bytes
SHA-256: 1a037c64d16d434b898cbc3f409e1e280a12ccb9a2655248d0f7a2c08d85a1b8
font_02_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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