Malicious PDF — malware analysis report

Static analysis result for SHA-256 7043a60d14f9d5b7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 19:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4539f0d56b23427d0a0320544daf5fe1 SHA-1: 639c996505f5f05e7dbf23d96d5e741819e07d39 SHA-256: 7043a60d14f9d5b7e0c9e8fb3d66b625207e369f0c2da1de7dee30b858b9caee
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aglogistics-bo.net/userfiles/file/79005225935.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/83603317935.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326a0eb712---ginedazekam.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/41791926881.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/zekategekikagujipobavu.pdfIn PDF document text
    • http://1carl.com/userfiles/file/63791412948.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qj9uihvc6tccpdenls7fn9s0b4/40475124685.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/56284705975.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7f0c51f405484145a5786e3392b75aa/wovezevetexuzipiki.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/28479786087.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/4104722455.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/250c98a8c8f0e47bc5c2a05258ddfae9/kunafog.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wabef.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zajejokuxenetepitelo.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nezomolusuru.pdfIn PDF document text
    • http://rapet.hu/files/duzovom.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614151e0b4698---rosanujemefiv.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/56357954608.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/puripef.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/nidavukelaz.pdfIn PDF document text
    • http://www.bash.cl/media/file/lumitoxigukal.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/16544392056.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a19a98e1767ac35cdecdf5b65f01e754/58564537559.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kanonejagas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=recuperar+archivos+borrados+de+android+sin+rootPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 18240 bytes
SHA-256: b7dc6e30a24e54ae7214039344e2bf88c76e8cfcd20b9b02a7e20bfe4b1ca546
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10916 bytes
SHA-256: cd871a4d3a0ee7a3ba104a274a98df08435aa81569c6e412a6ec9b5313d10b04
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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