Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d42c595d607c91…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 07:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8383add70335c2bbcc852c7d6ace34af SHA-1: 44e467bb8dcb6a07d113f5dbb4a185c64063bd0b SHA-256: c4d42c595d607c91ca924c09345c7a3d6200f72f668875050e4c04656ae781eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.romanschatztruhe.de/img/files/6052285427.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/linipipizegamu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/xaxegufamozu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/g3qkrhp122ug88nsb5la23nkk2/logisoxul.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/kirimine.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xoxor.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/kefisu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34819448511.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608857592789d---36457300938.pdfIn PDF document text
    • http://spharma.ua/files/file/zomanowaxaj.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/77602697225.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940326ee28b---pujusutofibobowafixedasuv.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipotigezovosofidoto.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/gojojusumajikefoni.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mikiwa.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/68bf649f558cdc13c043c428ddb53e1d/xuguwikunuwelo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49633305449.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/40154167446.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddb6a42787c2163b2d569b087cf2e11d/64345189562.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zulobusasafoxomosomo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c915a94284---5068244927.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e593c109495cb77fb2ddb328c542106/47007376352.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d048b4087e50a967f3c87ed46c1b7b00/54518653939.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160934189c1e00---balejusogegaluri.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/90327258155.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfad8ddf57---76014930426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=esl+speaking+rubric+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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 10892 bytes
SHA-256: cbe4544e2359218e71675c5a5de98fb9e3b4ee2b0e1f644b5753f9ca90dbbc70
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 18152 bytes
SHA-256: b047bb2e25b6c157e0d1cca889c52e495612f743c840b682d91b147c3defdb07

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