Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ece26371c58ab8…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 15:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ee2628e2171b8db65d9b910c93fd626 SHA-1: 80827c18d1061ef00128b83d2ed78106bec0ccec SHA-256: 81ece26371c58ab8cebd8ffd628bf0a457102cd1a86fe77075722689beccdfd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=the+way+of+superior+man+pdf+download PDF link annotation
    • https://ldoris.com/upfile/files/20210903090302.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/bugomafap.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/xurujusep.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/52a8ea6d8561c2d625d9d903261e8553/zopijifumokifopevewix.pdfIn PDF document text
    • https://fratellifurloni.it/file/74253072028.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/tugirelijirazadoxuw.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/toxemuretipugur.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0581c6c25---53864522762.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43088718068.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/panejomaxuvujozonesawez.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/83195152908.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/63245419597.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5119f0e3---koxidisotep.pdfIn PDF document text
    • http://lecostationery.com/files/file/66224988003.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/52259304848.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/53168841920.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/nuzike.pdfIn PDF document text
    • http://atrsara.ir/resource/files/2029852043.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/53378347644.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lfhv5qsfoco97shmi3842ni6t5/3885119698.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/21129848448.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210913195738.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/zexikopugikizexonofav.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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 17480 bytes
SHA-256: 24f1ec8b0d78a5a2d00c7acba0d69f2b203950ff454bd3cee6bbb115e6476d90
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10928 bytes
SHA-256: f23413ed8a3e2eee9f4c7d82d4fad813e8e3369f50cb410da735525f801d5f45
font_02_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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