Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dd2c57658a4a2a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0071c9936501ea7f30010ec334d23440 SHA-1: 7f9c01d43770b7f319b681ee736b49c8c932e82d SHA-256: e1dd2c57658a4a2ab7ee633a49e70c40efd6d2bed9239f46a5db1fc817345fb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with several URLs hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted-but-compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://autofactory-jin.com/js/upload/files/lomelipofapitasikamel.pdf In PDF document text
    • http://bkht.vn/userfiles/file/69800936891.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/diwesixovuvir.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/85368717786.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/20836762532.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e8664e6b6d85c0580aea8f9a6ce7b03e/zozeridimewumiruka.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143874606635---finagubesojavenowonuj.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/64387570744.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/29585286672.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb025c1cd---lotukobimixedunupu.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89864311280.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/79389771449.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/goduk.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614463fb159e2---61722683198.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/16618131430.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/sajatomulutifuzebi.pdfIn PDF document text
    • http://goldia.cz/data/file/46795680984.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/xusiti.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/32103966852.pdfIn PDF document text
    • http://acelybio.com/upload/files/44228568149.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032333451920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=resso+ad+song+ringtone+downloadPDF 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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 10552 bytes
SHA-256: 5a21a667da9afec55bba49c5aa8a1a343a064e3eaeae13e1c8c731b2c6f7c086
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16672 bytes
SHA-256: a2250672fbe62a724aa0d89881532b4b573ecd7ee93ad1e06de99597349605c5