Malicious PDF — malware analysis report

Static analysis result for SHA-256 71956e4f06005cda…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 06:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3c8768194cdcce5a57da96f42849033 SHA-1: 21154f35f898ba1291acfa0737811ab4fa9abd3e SHA-256: 71956e4f06005cdafa690cc26b333410067ac5cc40977a799d7bdbb68a5de9ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm used for redirection. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing lure. No scripts were extracted, but the overall structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=galaxy+store+app+apk PDF link annotation
    • http://systempro.kr/userData/board/file/niruwirejexuwop.pdfIn PDF document text
    • http://stefani.cz/fck/file/34447576205.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kiwepakudotu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j1f25gd4mlq6l7urclqvhqgcjo/55944362675.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/ramukakej.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613503bb29ada---20956898425.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/novodozunajiwi.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/xufotasonuxoramosog.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hu1i2kefrtdujuos4brevl94dk/8027719646.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jonawav.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zaxoperibediwufokepexir.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/lazanupomemixad.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/nupekemata.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rajinebidojodizaxovup.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/92895890007.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/38280057942.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/wemix.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/30a28670f37f32fa99e36996e18fca4e/vigup.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89429299639.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/mobadosivinoj.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/81223296998.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/gesarawerunex.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/kimefunufami.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kb4o4fkhfftdboli7nge1t3nr7/bomipimesafosaral.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea324c426---sefufijapivenutebosobugu.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/36943421405.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_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 17356 bytes
SHA-256: 81fcf70482600186731cb2e205c15104b629e1c2c873865dce971fe490083b5c
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 10396 bytes
SHA-256: 042a03cb6b6e1e8542b7c23a6d4329a6d0560fc138f1f065d6b32f604f7ea76e

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