Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6735ff560a8598…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 23:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50dbb54bc77b1d095419433bae6a52e4 SHA-1: e4cb0be890d4b66e909348acf595faf3667a24c7 SHA-256: dd6735ff560a859868cf01593daf3df9f43d79e2c81bfeafc14535b434d6b07b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains identified as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content or to artificially boost search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sevenseahotel.com/uploads/images/files/loduzi.pdf In PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/kunubolodowuja.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210720_52B1068EB0994577.pdfIn PDF document text
    • http://artospace.com/pics/file/wobilazo.pdfIn PDF document text
    • https://noddy.nu/images/file/97967369276.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/muponezakuzekopalijizowa.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/wijikozakoz.pdfIn PDF document text
    • https://ancoraeducacion.com/images/17011781884.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ce9sh9c8081olq94n990triggs/xumedupagadalivekofed.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f8d724bbb39a9249ac28688f3c1b103e/vepipowujebi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9660d9315---91040652104.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/ditoza.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963fa9a7276---vibunuxoxo.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/61923397108.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108210558417011.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3d0115bffa02740fed7f2ccd9532f354/jipozelip.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/mowesaronumorejuvawubir.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624385530675729941.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f48b3191c218df017fbb80b938d3a5e/dixusarelogusivatidamo.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/wosukimevurokukadi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/19124447864.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4edec04488---varupuzogob.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/28166337159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=supervisory+management+book+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_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 11380 bytes
SHA-256: a42d83ecfdbebd07e6ddc06467bf77806b8f07bc71f7f91afbb853ba8f3ff006
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 18504 bytes
SHA-256: 7cb5c93994bd86fdb68597f31d06c4785fe88a689bcefe6b90cafe31b319e0f5
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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