Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75594d103e1d676…

MALICIOUS

PDF

84.5 KB Created: 2021-08-09 01:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94e4d4c425ad3ccf49ee7ea6116e240c SHA-1: 3b261cd42bc134108e292cfb8467d4223ca9adfc SHA-256: f75594d103e1d676ffe16e3c4d380eedfc87c0dcdd105826f7293b28f7b0b963
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://coretry.ru/uplcv?utm_term=how+to+get+208+volts PDF link annotation
    • http://tingyi-bnb.com/CKEdit/upload/files/donafotoxo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/90b8ec590ea68382fb7c2a4151c140c9/92361022192.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f8f5200de9ae8751a2a6934271f219b6/zaxig.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tupaxug.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210807095450.pdfIn PDF document text
    • https://caffedisanto.it/file/bazipibutiropixerizokaxuk.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/zetamadezesumafovelixew.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/2244792707.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tua0lgam23kgh261vb0ktv6980/2632561632.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/73491948255.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zukezot.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/75206650921.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e64d550b---raxezogaja.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/vupugerebajawi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/kogojoxixeluvate.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/gegukevipobelotozodola.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/36576674376.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/84215717213.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ffb5776d---94970238532.pdfIn PDF document text
    • https://bamor.org/userfiles/file/wemiwidomuwojetifixeg.pdfIn PDF document text
    • 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_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 17300 bytes
SHA-256: 8f952ed57a625d0bcbbe8234ab2e91b906b38c44f50264e2f53ca38c11f32da7
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10420 bytes
SHA-256: 0c7d9a67e683d0cf52f406364d81e6c6a2cb57744fef8494391bfa71afd82328
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1