Malicious PDF — malware analysis report

Static analysis result for SHA-256 e102eef922f45d12…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 13:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8815463fa415aa273a71beb34765765 SHA-1: c0c100fbf3d1ed67814a78ec7189d0dd0d908fcb SHA-256: e102eef922f45d121c0b7bc1b65a6eebfb14e585ec973aac232143591e42bfdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to potentially malicious content hosted on compromised WordPress sites and disposable domains. The presence of multiple PDF files and the use of 'utm_term' parameters in URLs suggest an attempt to disguise the malicious intent and potentially track user engagement. The ML classifier and ClamAV detection strongly indicate malicious behavior, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=download+novel+delia+by+roy+passenger+pdf PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae9768892---30100055402.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xevimefidapu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/79115432263.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/55225803559.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/xoxofisolewir.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/46254254584.pdfIn PDF document text
    • https://digiconelectronics.com/media/lawegipole.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613053cd8e8ca---rugofulowoba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc22b0e5d6---xepidofanatejifuvar.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fapem.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jimakuwatudaved.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/57073649313.pdfIn PDF document text
    • http://primaneighbors.com/userimages/zijarawa.pdfIn PDF document text
    • http://chemicalengineers.ie/images/moronunuxazifogajakevexew.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/19446635748.pdfIn PDF document text
    • http://kes.org/upload/editor/files/39308582718.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/69737220701.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kivolelonibojorugibam.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/xumiles.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/dojidam.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/viverelujajivejug.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/90ff5bc77294f6a8f36915ef2e64c2fd/sumevugelogutafemiguzid.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/18229067362.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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16832 bytes
SHA-256: 6affa0f8997bd4571b3a9f85cddb801bdfe0f6ca264290ecbe2993fcbdc26194
font_02_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10980 bytes
SHA-256: 86e29e17f0fb6f3f4f0791e3da0e8e1264f2a291b10d471f59b7663de6f0f749

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