Malicious PDF — malware analysis report

Static analysis result for SHA-256 f460da65756d5d22…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 03:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5527b2e5e7488284c78c039a793d2cf8 SHA-1: 38c53347c9d02bb38faacfacb662df6d7d65d00c SHA-256: f460da65756d5d22ef982b6dbf8d77125453044961e6cebab2f79b40b6472d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vulidagaguneda.pdf In PDF document text
    • http://infosierra.es/images/editor/66028764500.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/woluxubudabifewe.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/23257920131.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/49339897119.pdfIn PDF document text
    • http://guchenes.com/d/files/16487808509.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af883c229a9---55099256235.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/nulepatikabam.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/juridafavudufapot.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/86136068105.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/od7tuaarh0meg66i8hvrtbqe8v/gonudefikerejexagonobo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/42150269393.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/59679343182.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bfb494ccd034dbf9e655455de42afa2f/livijakatoz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af65bde91---17068964938.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/getaxo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3daacc978b8b28354cee92e4bcd12669/lagotevonukewug.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vulekomowunumefenomu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/paguxematatoruniwikifur.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/776b70a06a16a6f155fb3b7a13a47cca/dudogisezugud.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073d52600ce6---xugux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tabla+milimetros+a+pulgadas+pdfPDF link annotation
    • 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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 19768 bytes
SHA-256: 0ae95f7cc2429768e6fac4e4c501b98e841eef1fcc1199a8fae962698019ecd1
font_01_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 10940 bytes
SHA-256: 7d500713a8a4ea5c8749836af08a8bf1e9eb99779c31c828d3b0fec390b54d1c

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