Malicious PDF — malware analysis report

Static analysis result for SHA-256 37945716ef3e2730…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 01:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a06544a1965cd580d67d28d176708a55 SHA-1: ffa13a74c00b88c623ee1248f033f0824f45fefc SHA-256: 37945716ef3e2730baab127378d1f7820f36d736d4f57106b7521902897f5498
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests the document is designed to redirect users to malicious sites or download further payloads. The primary attack pattern involves leveraging a link farm to distribute malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=acca+f1+syllabus+2018+pdf PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/74396674649.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3ce7dd8---15736344254.pdfIn PDF document text
    • http://wohingltd.com/userfiles/99390879999.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/wumemub.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/39060771416.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/vuxasebinonisinafatugedu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/41832771521.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e285e0659f11d8761d64838f413353e/visabazodinozamov.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/47519574761.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/4740417497.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/92199229317.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/61953095930.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0b0b2e26---98906014781.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/63046058337.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6fc322c828eb508f78c5122523d2113e/18321856303.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/18300623850.pdfIn PDF document text
    • https://mar3ol.com/Files/files/naregelam.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/werovibov.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ladadoda.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/sorigomaja.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/xobazototokunapog.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b07b23a6---gunotepepitutili.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a612b22a4---46940146373.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/76170190546.pdfIn PDF document text
    • http://standardamulet.com/files/files/nezakezasetibexufapo.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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 10804 bytes
SHA-256: 3318bbe6bda947409cda0f86dc9b723b461f766cc5e707d773828ff35c4bd753
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17772 bytes
SHA-256: 1d8a12077be07cca83fa84ef4fc133015267636932563fc0a7ac5e701417e576
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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