Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bba75e8160c3ca…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 01c74a94242c8e5efd9275d9284e8ef0 SHA-1: 0bb114f25c786e889b6a0490aecd3df35adecf09 SHA-256: d4bba75e8160c3ca6705479cf0d93bf00b7e144b5fbb9f6260eed99d01cf63af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=krunker+all+skins+script PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161309ce3586b6---babalotozif.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/95246235621.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/mipimabomiteton.pdfIn PDF document text
    • http://186086.com/upload/files/gibujeda.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kebigepapozuxowirobizugik.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/34652583045.pdfIn PDF document text
    • https://2winit.com/Files/files/74138820863.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/sabibobowegojuden.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147a67b57a05---xotokab.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/podevogixivaju.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210918052903.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfae1e1d2---83194220822.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/31743648222.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/zakowekitovowulenevugo.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/36929981953.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/talepevusojenedarogulu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/18518477761.pdfIn PDF document text
    • https://marosme.ro/hirek/file/metorolokamog.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/rigoxutazonug.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/70557900045.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/mosij.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vsh74d47qj5onc4flu0l3j2e0f/42073571364.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/volegadomax.pdfIn 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://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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10428 bytes
SHA-256: e9177f243f5ca12ca1adc84b2a1a4445fa1d3b418f0c0ead3ee03be3e5d805b0
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 19424 bytes
SHA-256: 6164bec03ce4a205d676882722761929f3c5182e2f426d3c0d7199f2112a0f2c
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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