Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a51abaf5b927a76…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 13:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 507ebe01399d9e11e98f097e973b9ec2 SHA-1: c096b58cd1dbb861a0c09cb7243e9b0106cf8818 SHA-256: 0a51abaf5b927a76538eeac984366c237d36f16d0cbaea7b2f2279cf2e24c256
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7829

Heuristics 5

  • 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
  • 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.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613569b28bab6---97083376695.pdf In PDF document text
    • https://maggies-handmade.com/UserFiles/files/58764057310.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/54343862780.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139090c442c6---zavutari.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/11040185175.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87089314260.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/bigufijowo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/81991780126.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/38502139464.pdfIn PDF document text
    • http://aven.su/userfiles/file/favatirotetex.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/99dc664e372e84a7aa935d8097da6481/33410808150.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/rezavugalixulanafox.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/37736775195.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9cd86230ae3049b39edc626157ff8fe4/76300977912.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/39209866069.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/2237159628.pdfIn PDF document text
    • http://domexpo.ru/up/file/48874079752.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/31793921379.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/lulutumakurikesozoxigo.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/xikolemukekesuruf.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gijebukuredezepawesikedo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e042a70ce---41583751543.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/bevin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=super+contact+backup+apkPDF link annotation
    • 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 18540 bytes
SHA-256: 86abdd259779b7812f374a3c26ddd003806b33c15257de4afb1f43e4c21ff0ea
font_02_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 10468 bytes
SHA-256: fd58fc30e2b4def27629e8fceec07e60b39ce631f8f7c5d48996063b58049383

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