Malicious PDF — malware analysis report

Static analysis result for SHA-256 6636171a7346d75b…

MALICIOUS

PDF

77.1 KB Created: 2021-08-10 10:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 22b99e7f90eab7f08dc1f4d072966df8 SHA-1: b84d8638b092948145c2ff2325488e5ce8da7926 SHA-256: 6636171a7346d75b109e5114f530e9e1204471d2bdc5c9118c03f96c32c07748
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of 'utm_term_redirector=True' and the nature of the URLs suggest a link farm designed for SEO manipulation or directing traffic to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00602c2a0b---nexowibajiwemipilepikomi.pdf In PDF document text
    • http://ohappy.org/userData/board/file/wigolerikuz.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7421a52b19ba368fe813835d8feb9f4c/variluxosiridezezasu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/909fa353bd96917ac287625561e40bb2/bugoroseresefunuxu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/82129128868.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/11322aec520c15c6e29785ede2b2dbae/gokuvafet.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/24219954600.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/lakuxuwuvufojazofetud.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/52173784182.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b497a4238bc---timarakomewolot.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1cgs3e6ucpu15s4rtdd4m045ll/25333301352.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/65362643040.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/xomovisowig.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/47022754237.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pja8a92aqp6930rd9jnhn1jctb/xufavikowu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/barevibunejepu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81426125231.pdfIn PDF document text
    • http://scsytech.com/upload/files/widotamotulegus.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604a339426---4646272708.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8vrati6fshv0d0ao5khrnds1hu/tefujumidepedurajeden.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9b8ee8252b20ebc066bad9095b87c9e3/bidoka.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079388b9e30f---koxubixutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+pok%C3%A9mon+rub%C3%AD+omega+gba+espa%C3%B1ol+para+androidPDF 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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 17048 bytes
SHA-256: 6150ca9893ef8ee314745cde2d5c7a3d4b68a111ecbadc131dc2f61a6f2c6cee
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11516 bytes
SHA-256: f4695830b0f88e98b1d54aae1078068ad405f7ee829b316ffac52b15b797562d