Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c52ba0f3b7f7d42…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf9d5fdad82623880804c6044b1211d4 SHA-1: 1b228153ff9ad3ac9e8c820e3aa320b992ff9081 SHA-256: 4c52ba0f3b7f7d423d68f2d057e03f2c5ae12537492980e422fee7ddaa967a12
196 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=password+protect+pdf+to+word+converter PDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f6def2b90---watubikipolusowonoximez.pdfIn PDF document text
    • http://packturf.fr/files/vajaxidevilezutomowuza.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a0jbrg6dl8vg9kuk8e10gqtqdg/22062803407.pdfIn PDF document text
    • https://agermag.ro/mm/file/larozumexas.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/35703393988.pdfIn PDF document text
    • https://jetaime-shop.com/files/dixixatas.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/miwudaga.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071372fcc6a4---romatedoxuxurezodek.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/67773153362.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/31259274084.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vigekitefolafez.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b26c53fa9c---93821035299.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ae33c799---zotokelivele.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8fcc22d9---komifezonide.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/kajitil.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/bixikimegidefa.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/68166996604.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/99566044119.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd512eb0692---90763245855.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/763774ee480f87b4a4b18874c76cb840/fidibekeketi.pdfIn PDF document text
    • http://tavio.su/files/file/jewawetalapadagajuguxowu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c646f5bb9f12e066fb59b3bf5d4db53/12540913557.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb4d6697d---79792344259.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f06f8176c18---xiwewoxal.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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 17056 bytes
SHA-256: a1f3fe280a1f5ef73df998d36bcc4d0f7c94034494308215118090ece1274e8f
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 10628 bytes
SHA-256: 028ac20d6e1fedabf94f9bfdb7a19f391d5b00c8906fc6fb32d7f46c7dcdf524
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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