Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dbc519efe347d3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 02:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 012fd4d9fdb594c99a9817e31752079e SHA-1: 3dc8b43def96e721ae5d995666ae829c6f6baee7 SHA-256: f1dbc519efe347d35f4906b50be0b8a74b1c554702c15b4b2a6afac2a980600c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as redirects to malicious content, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bedbaa3e---11101492269.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/95j4uvfij1mj7h9oaa7b7d8ofq/65019243590.pdfIn PDF document text
    • http://iwishop.hu/file/23116315413.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f1207ba6e---zujujasob.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/gerupegiligulaluwosiwujo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/larezilokilixuri.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/wukakivimexurok.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3174a79eb571709f15352127fb989f13/19225153823.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2q8h2ablbiavp49mlgvj984mf7/98898284068.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109061212318220.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/11546806097.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l00rm3cbm3u2suscik7hcc3p6p/40717211198.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7830aa61533e6b30e7e48fb9a17123b2/zokedu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/rejelajiruzifugubobap.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d12a6fa6b---sirisokuxurisusiwoj.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/30ee056946984639bf3eef2a20963861/88711587989.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070312080a95---79825224186.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15e4d0688a0434323cbbb1f256e3c06c/49980944843.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079914a6b065---72372059966.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mmuqqpl57odb5mfq0v17mnnjh/81986384859.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/41930864801.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112a9184908d---pudewazazuw.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/bepukew.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd33192e0---lebasavejitevo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/57104003536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=todos+los+presidentes+del+peru+pdfPDF 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_off0000c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 10392 bytes
SHA-256: a3b78af3ec5c1a13947b92e46fb055ff228d26c8680f44329089e119b4951e99
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 18252 bytes
SHA-256: 7456af863e927c1e801783fd77e3e75a166c6ab8684a5dbcec71ae8032872263
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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