Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc93f1ec72b7c7c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 08:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a36cb967a657ac53363a22f230bfc08b SHA-1: d6f59f700c5b22c8689f48aee46b172050ceccac SHA-256: ddc93f1ec72b7c7c44d5dd5c78db8977da9d80067dc313167b493f58aaf20947
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, indicating it functions as a link farm. The presence of a 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic and multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' firings strongly suggests malicious intent, likely for phishing or malware distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://akgwealthplanner.com/crm/files/90225666084.pdf In PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_FDE05211FB857AC4.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/fagirotawokela.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oukildtlvvh36a5lqpvt6h0rkb/dikevuxog.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/duxemosulakabawuxajorijo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_EEE4184B0ED8B898.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/76450593285.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/46981613126.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210909_205648.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/678faa8c56077beef1a7764c276bc685/kelewafajobero.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/86618754630.pdfIn PDF document text
    • http://change4best.ru/upload/file/sozonowosexavasuwazupegex.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/90260497098.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zexekafatiwexevoluliwezog.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210924_DB867DDAA539503A.pdfIn PDF document text
    • http://hevolta.com/upload/file/59453151978.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pemuzadutoji.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109191059528743.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kavasovenatabivafi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/mijotonalevilalusokokaj.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vurijejuwal.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34099455148.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1426c7ddc9abdd0683dad31936ce9b17/pobesumuxeb.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/16959621138.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/25479879500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=grammar+in+use+apkPDF 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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 10380 bytes
SHA-256: 7f0e8d02d7e67c3d7a154338644de26805406baaf1859ec32c2d10fc6b57cad1
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 17068 bytes
SHA-256: f8eec28f7d9342aee88b0ea1073fdb034d750b333b9746769f887f59ffbe3773
font_02_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1