Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae37a926f1ce9aa…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 22:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4000821999e7fb192ca349b10fea152a SHA-1: 47118ca57a7286eb016144c7fe4571a2a1d709a4 SHA-256: 7ae37a926f1ce9aa51e852fdf2aa0f99e1d459c5513412427f15f88c72299c86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URLs, many of which point to compromised websites or disposable hosting. The heuristic firings indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://pixomot.ru/uplcv?utm_term=how+to+respond+to+biggest+weakness+question PDF link annotation
    • https://jdlpartnerss.com/userfiles/file/76458108054.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/74282751177.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88e75c8a0---xajukutezubawe.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/73945003265.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8pdq16g7hcfck19b59u4r1ck0b/74828510809.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b650d259c---pimixeselu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16119ee3274f17---59458369179.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/34689270919.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/035f924cb6d737a62166bb607fb4f8fb/19357505720.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb72b49bc---sixevopavegigofal.pdfIn PDF document text
    • https://cubic.is/userfiles/file/gemorosekitara.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/22444922859.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/43230887696.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5cb1e12b---berovuzuwazojajul.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/11362018923.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/36759880763.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/99615785163.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/soxedorog.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fetukox.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/94541487692.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bezezunowujulugenusipibe.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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 16220 bytes
SHA-256: 3677517f58106d48c8a98f5e34a9eedb20b5018a2f2f69271b54db692d2bd935
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 11076 bytes
SHA-256: c80823aad5b89b5422d72c63d141e8fb61bc20c70e983b9d2f4a89cb10f63487

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