Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e3f1284a962445…

MALICIOUS

PDF

89.8 KB Created: 2021-09-23 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0c97da4134afc0cfa84a31e76bd4373 SHA-1: 52a5952f5570eb98355765bdc64d9f84893821a0 SHA-256: 68e3f1284a96244507dc75cfbaa22e9f4f81081ce16c960dafdcc576bf6b843c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external links, several of which point to compromised CMS uploads or disposable hosting. The presence of a 'download button' heuristic further suggests a malicious workflow aimed at tricking the user into downloading a payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://recepti.plovdivweek.com/js/ckfinder/userfiles/files/5166733851.pdf In PDF document text
    • https://metricgroup.it/uploads/file/vuzedezijawetivivetezedoj.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27592a2c40ae5e811d954e03d305ba86/jibufufeweloleva.pdfIn PDF document text
    • https://baptistfriends.org/media/bapexewovezigukeworatoj.pdfIn PDF document text
    • https://foulardfotografando.it/file/22611023278.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/16516692742.pdfIn PDF document text
    • http://samtekelektrik.com/files/xumozilizi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ikq7f39skf9lhr1mnqff4ira9u/63831461526.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/zajoxelon.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/kivebamak.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/gozoxogamusi.pdfIn PDF document text
    • http://terrietanaka.com/library/files/93808227930.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1fb9d6d3401763c116dd9bccdec044cd/451034790.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/60207226616.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/11/37831503148.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb2acc6da---mupafulisu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/nibofutazitinitozidaguf.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/74866700339.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/46596308193.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/44504809133.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/soletazove.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/66811228956.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/14696795715.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/pedugefij.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/65866037617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ios+movie+appsPDF 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_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 18096 bytes
SHA-256: 785187514f70182ecb4135a8fe74f421e19e0fa9c87222c6207bc29354401314
font_01_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 10080 bytes
SHA-256: 1080ac09ab8e397188adc4a6746ea8a1e9a081e55268150472303131b2e51a4f
font_02_sfnt_off000141b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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