Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a01d777e613ac01…

MALICIOUS

PDF

74.6 KB Created: 2021-10-08 13:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d88251fba9d59aac683953e366d96be9 SHA-1: 0c3dacc6bd45dd73af177d403f9d05359586c452 SHA-256: 5a01d777e613ac01c7cf747856750d81de5f9e719010e88669145b4a83364c8d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e7a13131d2aebc8e9ae43e624193dce9/62017444299.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/xizifajarumu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kanis.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fubupemuwaloxit.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/69149348825.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/migovojagugekopeme.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/94045976743.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/74466465671.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sitususuxut.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8631218450.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/59685494471.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/29473995532.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/13885748538.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210917_537F0E856348C3C9.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/71558835446.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zovikerakupu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3109d38d6fb43c9d7f06c4ee08297951/bigum.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/mimem.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/guwimiwasotip.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/59185517005.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16153f31b33c9b---lazesigesapakir.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/8079128722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=past+perfect+reading+comprehension+exercisesPDF 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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 17704 bytes
SHA-256: 5a72ec91d6ba8f6a38f916c6f5b1faeee1a0d199daa2f273648c2180cccc42db
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 11124 bytes
SHA-256: bef8a1c15c40896d8ecab63f9e65ef63990e7597655ea9fae64144d0cf00c295