Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cf58f90f3160ac…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2805c379833f8106bf114c8b901ad121 SHA-1: bdf6299ac6e160ad54a578be4d8d87f4c92ca12c SHA-256: 24cf58f90f3160ac5151ecbd8db481a12eed92d9ec94a7ee1711a4b6a0472e34
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document exhibits characteristics of a phishing lure, specifically requesting sensitive recovery secrets or private keys, which is a critical finding. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or cryptocurrency theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://synerhu.ru/uplcv?utm_term=tronlink+pro+for+ios PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c760ea606---kidudogufeximivomaxe.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf997babc---24717094586.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/32247d23dec6ccffc76a85e665b77ac1/tebabalopibawu.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/60063972718.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/98311827846.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130067fe73e3---14448884.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8b0c776c---48358922657.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30044112086.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/31522211299.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/zenufumevaloxekawavama.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386f63cc998---nuxonuwazazimafugemobiv.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210907_049AA25488DECC12.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/72865347005.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/21006138813.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136921b4f927---fareleki.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136002621b7a---16970817517.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/72461130022.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202196059122711.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae424f43c---79347961128.pdfIn PDF document text
    • http://cityfate.com/files/files/tulatutemazivijedotibus.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902022204192107.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/69537335268.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/sepalubod.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/fevekakonulogisafape.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_off0000c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 10016 bytes
SHA-256: b25a4717c270d0ad256f34a787e55c93d05c38d584e69206588f5dfe0ac81f88
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 18660 bytes
SHA-256: 392b44c609b71600374fa21b7011d1df2019695adc69fe127e6bf6c72974d079

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