Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63b307ccce9938d…

MALICIOUS

PDF

72.2 KB Created: 2021-06-07 01:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2d01023c6e87506b0563990ae0bb081a SHA-1: 5e8d06631f510c278b5deb995a35f9aca2387baf SHA-256: b63b307ccce9938d5e8051c0875952e4fb3b7d7a9ca36388726bc1e2606b3950
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=how+long+does+sibo+die+off+last PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47d9cb0b5---tuxegopomafozorixore.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/29897540066.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b21a9032---22571268719.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b0998227---8211093757.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kakesetavakegujimiwivuz.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/selidita.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/94864170668.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b058398af629e2c56b6edc7b6ea1590b/deneli.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/betosup.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b25b50255---16713218052.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/347fen1npgi2m3h6rpvdfctnbj/towojasojejat.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0198b71b2---41844815005.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/t71m18cdemksc867oee1idov6l/26282369610.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/nasowajenituzo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/mipokekofimoxozedo.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/531113c10236d8f137c8161c11899bbd/48595199789.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0d7bf614278be53eea36746f3503276/lorefowekereduzuwisif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 5172 bytes
SHA-256: b465a6e2831191db1d1707828d7272e14db3d4e80947a996d49f67c2d8e88ea8
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 10472 bytes
SHA-256: bf890617ebaa33d81ac0fd9a6522dd9eade6140ec064fb77f32918e69a6b01ba