Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d86b1be9464ff51…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 03:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 128fc8636ffe0614dcba98c9b88237dc SHA-1: 4925f144230386a2a75df42c30f356c07e405953 SHA-256: 1d86b1be9464ff512158a9920566af2d6d592fc4d20d5fabc71df50320409775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farms indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=cooking+chinese+cabbage PDF link annotation
    • http://kleinschaden.expert/userfiles/file/suditir.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160943b8529e7a---73426988669.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/gefagibojowovopel.pdfIn PDF document text
    • http://contelex.it/userfiles/files/77228348054.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/66000646853.pdfIn PDF document text
    • http://merwepizza.com/upload/file/26688683315.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/35428106934.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03ec50e83445dd10250c58d044940e05/dofanejenanegujunekedojub.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/064bf2ccb4c76e2fc983fdfdcf76a1d8/91075974818.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a005982b7cf9b09aa496e9646a3cef99/8087288501.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/61342405438.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901080133.pdfIn PDF document text
    • http://weingut-suppan.at/files/66888585968.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095222716a22---69338581329.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff11b3d43---ninuruxalofiligoxi.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/88011590348.pdfIn PDF document text
    • https://zhansq.cn/upload/file/93037009902.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/13141709449.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cir773ba4ejupk561jjn0k8ae4/53722681740.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roweridiwufubuno.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210704005303.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/9294197397.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dutupimazotirew.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8f97b8d7d---36793899809.pdfIn PDF document text
    • 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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 17424 bytes
SHA-256: f77374ab1fec3bafaccaee62347d94e47d8e083a61f0db38ee4ea78e12f339b2
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 10528 bytes
SHA-256: dd1194d26d63c104322bfd297d026ac7db805049d6353002f5879c915ac9377b

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