Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb0cb57bc717e42…

MALICIOUS

PDF

72.0 KB Created: 2021-06-19 00:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0800988b2c5ea168cb73cf1b66e917b2 SHA-1: 26a904793be8b6946b6528a9b9792c83f16020c8 SHA-256: acb0cb57bc717e42bb78528e2ecd9e205deb6e83216f9d6e43291b42ea433870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/32c41c43c7c86b9b331e006612b99538/12410038371.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1058ebb7e---68849588717.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d1ceb8548b8cb087c6a4179ddbbad06d/kolubuxuda.pdf
    • http://akcjonariusz.com/UserFiles/file/mibox.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608959bcb74d6---81284450404.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609b387cb8bbd---powab.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbedbd39a4---55648909549.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fat9gsejo388m4rtlogfsgj2n4/livafawesedamuwabaxomeb.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/41669834836.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f8c876a7ba06ab4ff5c1984eab3ffe61/mupoxoxevowelekunod.pdf
    • http://goldway.jp/upload/board/file/nedalopezozozer.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073c5b7d15---27402451087.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0soglfrh6kkuvsg8ahb1j9g53/68721444742.pdf
    • https://searchlink.org/userfiles//file/lewibaxijojotoxumo.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/10352812551.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/1740637880.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4459a4ca4f89b3d20af62816bc231ac3/sujifedufij.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4206b5c7---31674412932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spirit%2527s+bloom+comic+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cc.bin
200575ae3d29345f51b8c2db7833f33e89facba3ac35180c08ee05c0e33cf763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 5576 bytes
font_01_sfnt_off0000ebab.bin
3927755cf6fc211dd3a683d2fa5e467fb79c6a0e8497308991c083da67f25e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10976 bytes

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