Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d4b7019185ca5a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 02:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfcd1baf2d44285f5b07ad09705d0b70 SHA-1: f8dabea66378e4edc04e6f4d15fa2cda49d3e672 SHA-256: f0d4b7019185ca5adf9725f23eb418fdfe5a669b6e59b301e82923ef40616703
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amandatravel.com/userfiles/file/zaxijenipulotabokag.pdf In PDF document text
    • http://pytextiles.com/userfiles/file/88445490954.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210917200836.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/bukuv.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/2523167205.pdfIn PDF document text
    • http://underbutter.cz/download/foto/41176893437.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wexapuli.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbda53c5b---61150993203.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f91539baff2e338032f57694448454d2/natimuvoverodod.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/notoxamisokez.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/78208316845.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8d88aa6bf81bc868c62c875c66656632/824761058.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/forumajiviregu.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/2334851630.pdfIn PDF document text
    • http://knauto.com/upload/file///mawuvusuvinidinu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/peroboti.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/54339672268.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/batawubelogivi.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/fagimasowelipovebiriboto.pdfIn PDF document text
    • http://korytnica.net/data/files/60479311473.pdfIn PDF document text
    • https://penzion-palice.cz/content/dowoxinam.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/59492189.pdfIn PDF document text
    • http://lukinserv.hu/file/nixosexuzopefozag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=principles+and+practice+of+physics+eric+mazur+pdf+free+downloadPDF 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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 17940 bytes
SHA-256: 2600f5f39f98784973675cd2024cd9e0ed88a5bf35ea3b3b3d11337064226b09
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 11248 bytes
SHA-256: 8031551eec43158dfe5062f01473dc780f01e2b77c8f876b734472002666eaa6