Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea82413d471c3a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 18:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 719802b20793fdfaab45f6996d6d60b3 SHA-1: 561c039dbe547bcba1e0c7270af938d334c5416f SHA-256: eea82413d471c3a4af13ee5f067f52008a855901455ade44a7de8b29c4972004
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=transfer+contacts+from+one+phone+to+another PDF link annotation
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/98946321567.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/56901872359.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/91520431759.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c767a6---14362781274.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9d44b28a32b2c1a2a42a8cba4ac86a70/vuvolixonexowaregusexu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133492fbe472---56614608900.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/robubege.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/samipekuweve.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/tosemixifibopete.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/zazado.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/69596986467.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deb51ee90---fizevilunudodusude.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/6526133981.pdfIn PDF document text
    • http://446888.top/userfiles/file/80598659225.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/laregidip.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96bd6f342---xuveli.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/nepebixasodizanenu.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/rapuwiteviwavu.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/72738669554.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/78227836766.pdfIn PDF document text
    • https://kawanmto.com/contents/files/5566543089.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/fudejunuperusuroxajax.pdfIn PDF document text
    • https://kratky.eu/files/file/6815941106.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bekoxabixab.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 18924 bytes
SHA-256: 45fb7a685319b93204da7e20655e3b0c62b8562b91679003cb8259cda9fdd2f4
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10568 bytes
SHA-256: dfc2376dc19878a649c051c9bd6bb854bc1ab3b4f9075e3077167fcb222eb162
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1