Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2903eab06797564…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fee299dea60a0ae8d3c70acaef962352 SHA-1: 5fe4191d38f14cfe5fd565bba6a8a523e40462cc SHA-256: e2903eab06797564ee502129def694166a8b683db5829e37348ed4971528aedb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous links to PDF files hosted on compromised WordPress sites, suggesting a link farm for SEO poisoning or phishing. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/88196acc5173a56ba97e8a5207e09bf1/5335157572.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a9da0e3---zotimure.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/wixikogul.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/92460397335.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/32653474853.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xovasinexunipiwor.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/85951303978.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ske5bl2pu49heck81ojq7rhk65/52971531716.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/naritajiwexovuxi.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kadazowabiw.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/6197d142d21070bafbc4658ea2c9bfc7/10073028269.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f407b363ea87282afface4339d390d8b/fuvarerenubopazim.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc729abed0a70ee961f86a2ae89d39d7/45529400198.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/395186ad7806d85671b2015d4b10564e/82797919530.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/65790773996.pdfIn PDF document text
    • http://abnicum.com/files/file/97772830506.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107a608e17---88036370407.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8990d932b7204003d6e3eac5d751353a/kexilakupabomejukivof.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611f96f80584f---41221634497.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210809_015233.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/14635664359.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/98102841966.pdfIn PDF document text
    • http://eksternest.be/images/file/fuzurabudireziw.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/webisanaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hand+shaking+without+reasonPDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 17760 bytes
SHA-256: 577be1aa54c19e5842024db0505dd91b34cbf5863fd0148183f7d4746df066f7
font_02_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 10748 bytes
SHA-256: 22251b8332daa959a4a758b8af4c4303c90a335be973385d3d1d6d4e127712c9