Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab204bc87fffdec3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 22:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d43ee7483d0227ac8f74ef68c32b264 SHA-1: ec4d42325452eaa08d5c7c511a4162b83e2791d3 SHA-256: ab204bc87fffdec3828061ec9987d09d956fdaca36f5f7722f9432b47308e1eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=top+guns+2011+watch+online PDF link annotation
    • http://paraglider24.de/pics/fotos/1/file/pexawebasobofasufuk.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/fozononowosi.pdfIn PDF document text
    • http://friulanapanini.com/images/file/suwejefatadapajefat.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/57394111428.pdfIn PDF document text
    • https://protum.se/file/97245973589.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/51719409687.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12479ad0---17891621685.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2e46f42d---xoluvobizirudekafereb.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/dunupivakalakolewuk.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/40245041807.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e079f3b6f78db788200cb580bc2ff9f0/luzepubojenaxi.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xubotunijotafoxinaw.pdfIn PDF document text
    • https://sanagustin.cl/files/vimesikuwisujinajivanukav.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/fufevimubazikagomepusas.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614073667acea---68260857750.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210918094600.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/63746071117.pdfIn PDF document text
    • http://halaljones.com/uploads/files/wuruwevudipabuku.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/bedenotup.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/15608476123.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/nopokivagofiniziwiri.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/direxoxeruxukexitikeduker.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_off0000ae0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0C 10996 bytes
SHA-256: f7fb1454386a9aaf5d9d807ee14ba4cdf0c8cd8b85f51378dd00d266a4ce1dfe
font_01_sfnt_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 15564 bytes
SHA-256: 194706b5c60aa001023ace27647dd26e15309a128b188dba0b9d627719ebff62
font_02_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1