Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d6a6d05c14c928…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 04:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39f83758ec768464974dcc3875d8841d SHA-1: 31873246d9acb32bc92c060306cf35b531ab8197 SHA-256: b0d6a6d05c14c9285fdcac7cb427bd450aa6091d5f344f849e0cb21140a18026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097bfca88ac8---volepobesememajexerido.pdf In PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/10596177428.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730bc3d8351---57518997381.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210820143537.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t9d08hafbjtrelk0919t7kach7/daguzeruvalekutize.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/33856713816.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/gixululiluzasovapuk.pdfIn PDF document text
    • http://geasit.it/userfiles/files/58216860743.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdfIn PDF document text
    • https://majubesar.info/contents//files/42460482683.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210721_1D8F783EB854C53C.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c18a338---nomawapiziwurom.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/govume.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kn6c2n3nv7cbme284bvket6gl2/dulakazabakibu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5561e091---vulidovakeguvatunob.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/41852714047.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/adfdffb39afa1a6b0b1b76be37ef87d5/86907960911.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/775fc27ba652f92a92d3afc7754892da/mojuti.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/tobakifelas.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/32707182907.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tmo3d87lei50hco6cl8ibtqck9/61429430159.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b765a8fe87a4c07581342251b4e5bbb/40709740213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=you+raise+me+up+song+lyrics+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ea62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA62 17484 bytes
SHA-256: 72a2f8f33fa92deefb915f3090073ab0998710f9ad3a75610d16e8a13f10e54a
font_00_sfnt_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 17720 bytes
SHA-256: 511ce532b9ed616f5b9b48e9f0438f1621aed4658c8b64cef6d2ca8fffed0a2d
font_03_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 11060 bytes
SHA-256: f42548239b76eca1175e6583e1939a27f9f3f1ba6df3161585f2e9e9bfd2e04f