Malicious PDF — malware analysis report

Static analysis result for SHA-256 518400214ad5ee01…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56aa77b8c9d29faa065ff22aabe7c01d SHA-1: e51ad9157872439b005dcf612d9c94bc40f2659f SHA-256: 518400214ad5ee01b3072a3aca1f5f4948ef5c557c6a4aa5598cb326aa7f84d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://khunghinhdepphuctin.com/media/ftp/file/jujuge.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbe603662---dorazapewalukor.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/rizul.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/rogikovugalevawuvokisen.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/41065208698.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/bemomoroluzegunudonitiz.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/770aa4e507322a7c65ff8e9d000c5a35/52192376341.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/lulijefabe.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/8575561006.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021092474813_634934589.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210908210755_4t639e.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614db778a4f2d---46936993928.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/jobuzixowu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69931055441.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/98567476621.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/92918983216.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/vizavarusokudozefezujo.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nefuxogijeraxi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kunemuvubumevox.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/kezumeseb.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/pesepatelukejuli.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/kopoxisawarafu.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/kejusaredadu.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/pudagudokanovexakarafikud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+ares+chat+client+para+androidPDF 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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 10792 bytes
SHA-256: b9d3fd6672f3fa4c4f2105fc1a5f1e5debc22017d5ed717ac7bb8407a05b7213
font_01_sfnt_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 15708 bytes
SHA-256: d5b5db7bb21fc1b81f9701468986a2ebe259e675d95512044611894726f0b37d
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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