Malicious PDF — malware analysis report

Static analysis result for SHA-256 8375313c91f766e2…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 05:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50ab0d03a098b913fbe5860ac2a64a85 SHA-1: d62d82733e7df948629ac968c8ebe433258f4fab SHA-256: 8375313c91f766e21be6c76bead602a0c09e8bdfedbf83c1872ca51993d2772b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by heuristics flagging it as a fake invoice and containing a link farm hosted on compromised websites. The presence of multiple external URIs, many pointing to potentially compromised CMS upload directories, suggests an attempt to redirect the user to a malicious payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=demon+slayer+comic+pdf PDF link annotation
    • http://mylivediamondinventory.com/uploads/files/85761817155.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb9b650e1---92464923117.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/xurinujovogere.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/rukid.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ac1ae973016d0c531fb342351464760/27012289186.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/42223821363.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/67e7c6c10af705b151387d53055822a0/46059805401.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/62966468120.pdfIn PDF document text
    • http://195exim.com/datas/files/mepopibilox.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/67155760966.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a185624---napanoxedagonogu.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/4707231801.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kiithto2sgj1gh03g82f586iv8/ribunepefogekek.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141137c1238f---95929707456.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911192901.pdfIn PDF document text
    • https://ka-base.no/images_students/files/31724256165.pdfIn PDF document text
    • https://hobbypet.cz/files/file/pineminakitunobu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ea869d1983e0f44f2da2c0ab0f7fd0cd/ranitobewo.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/jezepa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c90b9c9---nokalumi.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/kebokezilibediwokokuzip.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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10796 bytes
SHA-256: 81838b329332459f7fa346f9f4d1f2ac8ad4176a1e8c7b79f5a7c907ebc19f33
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 18120 bytes
SHA-256: eb8af94f84ce99fb138b1116dc2679cd287cb9aaff670eb1987bc3962c88535c
font_02_sfnt_off00013c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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