Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3645941c4d24728…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d03ef3c25df086f1896ce177fabe1523 SHA-1: 93c6d940ef7b78b2a68001064a6860764772ca69 SHA-256: b3645941c4d24728214d51c65e6e2392baf8a1aad7e013d95bbe5a3f742c1a77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous embedded URLs that point to other PDFs hosted on compromised websites. These linked PDFs likely serve as the next stage in the attack, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7899

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=app+wps+wpa+tester PDF link annotation
    • http://plkorea77.com/ckupload/files/51635676685.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109081918574894.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/vuvitusataku.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109162320466218.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/fupufarimofu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9959970701c649a277c20ad4d638c92a/jewulobit.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/61268223974.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/11540411385.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4193bca1---keliregunogasarowok.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jevexoko.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/79812237956.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dutuv.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914005236.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/gogapofaxumeganowivevudi.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/20962283389.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///98477932967.pdfIn PDF document text
    • http://fteq.ru/files/file/11848760163.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/38310704182.pdfIn PDF document text
    • http://dejede.com/userfiles/file/ditikelorewupedotabaros.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/roxigunedaw.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/56360512265.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55014492741.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed94486db6---64346986856.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/83329671904.pdfIn 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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 9952 bytes
SHA-256: b7a75fcce9e943d269e161f23cc200f72e0d53ca5edd15be785c99a10dff30e3
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 17492 bytes
SHA-256: 6c4aa948cbfc1591e479977dd7666edb12818484235176928e47fb9bb601abc1

Open this report in the interactive analyzer, or submit your own file for analysis.