Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b81c7239d799d2a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 01:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4cb49d6be0fe135c6255a60c5a3e151 SHA-1: e0ad6626eab609bc55dc14fc8b48eff75e11d0dc SHA-256: 8b81c7239d799d2a916884df73e0c49a41ef8a964d982ad5afca10b2de961442
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stylekd.ru/files/97229142509.pdf In PDF document text
    • https://amigo-shop.105h.net/upload/files/35488197484.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/1153207642.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26aa21a1c0---kireruzugirabimax.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/tosojirusexur.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a027e870f---wesotalebexu.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/24784416912.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f333477a---juraxof.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ob5n7eedcl3ahlbam6j7eies41/76147317243.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf7e20f7f1---revolemufamaxezalir.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///minof.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20724120a---10131028759.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2cd3b1672d1beb2f43ca484995273ea5/32885469063.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/godojewonekomoremefimop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c8904f1d---17053742192.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5luh03vcp5ambdqalrh5eve4s8/judowap.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/obabk4on9q53i5586vjpv2icol/sawixofajudiwobago.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/fedisexafukunor.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/jetemuroda.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/pazupoge.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/ziluxefizem.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10b03966b67808eb11580aacd759c407/33187778490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+worksheet+for+2nd+gradePDF 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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 17936 bytes
SHA-256: 436c39a4088b228a9cc1e417bd414b3740be7b83b1d0d2d3c9831efc86dd4c9e
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10912 bytes
SHA-256: b275cd018e58fc1069610d2c6631a9a1a6077adba68802f5f1ae6a714c07f360

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