Malicious PDF — malware analysis report

Static analysis result for SHA-256 72667d0e1e166996…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 02:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbbc055f54334f30dc87afe0bf7b7b5b SHA-1: d6cd32b9e690492f8634c56aec7f03430cd79ad3 SHA-256: 72667d0e1e1669965a07841a1ac0b7269ddb2dcc0a826eb3b0c5bebff2f56d5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to redirect users or download further malicious content. The presence of multiple external URIs, including a link farm hosted on compromised CMS uploads and disposable hosting, suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 http://itineraire-consulting.com/ckfinder/userfiles/files/gizelimanekotabexo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874677aeeee---wetojipakij.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/28136185865.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/dixasaxejafejugofud.pdfIn PDF document text
    • https://synersys.fr/contenu/file/litilolatoridofuvased.pdfIn PDF document text
    • https://drsaman.com/files/mufige.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/fawirasevivi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8fab2d3c8233ca27c51ea356e997caa9/pobiwamawigowemapenubude.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vh8ns8alj4ioer908mqq5t0j7t/75392430470.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c69c2655---58155311867.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/9296821652.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/dazoguzutufizu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8pbdqljhe5huv856pf65assota/88097223530.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608670d35c2e7---sivupemopusaxizakij.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f47b1235---pakejitazunisasizigox.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4995e7703---52233576960.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/jumeliviweturanegof.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/16004673596.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lojez.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nimuligulaxaraf.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/37113119053.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210807124814_e6hsou.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/valil.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/56215594369.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca8a3c709---xipozebisegidoximanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clash+of+clans+download+apk+2020PDF 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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 10744 bytes
SHA-256: e8d67bb873bff3b4f2b76c0198312429513c9c983660229e006505f11a49f07b
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 16200 bytes
SHA-256: bbdbde8dcf30687cabf33150c1f903873864a809045d5301ce40a3dde78095c1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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