Malicious PDF — malware analysis report

Static analysis result for SHA-256 1515fdbb73652205…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 06:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41e498aadecd940bbb168600402c52b8 SHA-1: 804c7be2a67d06289a1b35d92e1018e51675bf49 SHA-256: 1515fdbb736522054079c2076cc6e2d9c33dd3748299af761edb2aeb167e68ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8564

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f118c4aa8dd6829f371a86564404055/20019752130.pdf In PDF document text
    • http://bellina.pl/userfiles/file/pubal.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0297c873---geregapomezodisetib.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610644c250b42---27444367628.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea66d773e---venovuduvupaj.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b650e5d1a2f---47958438442.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec81c22d1.pdfIn PDF document text
    • http://altus.pl/userfiles/file/lalitidumijalezi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/83170302391.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/64941657252.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/aa991df23f8ca2a1662ab34d9530b97f/tapatalirikanemovitosijo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/8301524765.pdfIn PDF document text
    • http://klefmarken.se/upload/file/44924430486.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/67741817772.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9461c741b9---pikozuxiximiwupo.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/tiwuselotabogefigirol.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/digini.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070411362097.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/86716235914.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/99330391045.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/898045049d1f722b6e3da945de9e8061/xivekajezojugerupatibe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/43787992467.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/24596802769.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/25956452665.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sp84trves0bpk6t85i0itro5u2/51950293825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+kind+of+oil+does+a+2004+dodge+ram+1500+5.7+hemi+takePDF link annotation
    • 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 11508 bytes
SHA-256: 212d756e69a81ac122ea9323116d35a090e651eaf99d02c26fe0552f332f72d5
font_01_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 18080 bytes
SHA-256: 29b7984d253f0db737d1db2dbb58b2aa8b62797c770ecb6a5351d98e7539ccd0
font_02_sfnt_off000142f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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