Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe23ee502358faef…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 21:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67b0116f639d2b0a29bfcf35a61deed0 SHA-1: ef667cbe129483c02fcf870249823728508834ab SHA-256: fe23ee502358faef59b373b624dc6751530afd434c2977e3d26fc09f9c4d51ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms designed to obscure the ultimate destination. The heuristic 'SE_INVOICE_LURE' suggests the document's content is intended to deceive the user into clicking these links, likely leading to a phishing site or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=maxqda+online+manual PDF link annotation
    • http://tetobox-budapest.hu/uploads/files/nawiwolalezimebuvifafup.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fetojulozo.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/64097362842.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32fd25079---6222815095.pdfIn PDF document text
    • https://photojet.net/userfiles/file/59639431187.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/68379025251.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/kofurot.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62845123702.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1da80455a---30046702070.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/19781524713.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sagowakug.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/41849918901.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/patufuvelejazodabelelobaz.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b8ff61bf7f321abc3b7ae2904c7f716e/7896128871.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5dbb0d6b3183be522844cc71e4139891/30748386417.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/20a62cd66d018fcdadbf78bb5408f32a/visufekeli.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/lodabixanoligu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608196f2f21ba---misegatimunugitigitowuva.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/84763465204.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/29688822152.pdfIn PDF document text
    • http://hzqzg.com/d/files/widekekuvekejowatavazuba.pdfIn PDF document text
    • http://fitviewer.biz/files/file/82438076214.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kaxib.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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 10384 bytes
SHA-256: 1f1e8a59ecd5ae9fff6fdccfd825da11a6789fb87d9330867faf15e552294774
font_01_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 18036 bytes
SHA-256: b623dde124676604063c14d7cda02379d965a4f6345064e26af509feee1087a6
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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