Malicious PDF — malware analysis report

Static analysis result for SHA-256 929062ac334e3101…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 15:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10041e9c14ded0b708bc5c04e8e6d5a0 SHA-1: aeb52223201f738a211c905d2da558f11db2d95e SHA-256: 929062ac334e3101aada612c8f63e65ee0566ba43406342fd8bf4bf947559925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs, several of which point to compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lure users to malicious or compromised sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://muzeumkonstancina.pl/attachments/file/89698123351.pdf In PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/34315378860.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xavufopowuwuvu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/13c1d8eadeb1e96d381b509ff1f28edb/nenunedodarogarefepew.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210908002947.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/sibipawezizilinaveneleza.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/bujujawamipubalo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4b02c87---61902597506.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0a78eec206f7ebb8d8c9a7697b8eeba4/7254377650.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/4443808541.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///famojebi.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/90959708859.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_171943.pdfIn PDF document text
    • http://canadanur.com/resimler/files/mopajinumezarebaze.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/12642417358.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kesibozulekovexurimiw.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/fidokuneka.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sapipujujikozajudavo.pdfIn PDF document text
    • https://eclearusa.com/images/file/diwemagavijofaz.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/bimitatovujoxizofenux.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/eraeubr225bkfb8nqhoe67ca46/tunuzetapufelituv.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/58772661719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+joey+season+1PDF link annotation
    • 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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 16788 bytes
SHA-256: 001a2c6682da070b4432c2f76555cfff36411a9da7533671035c56b9c123fc8f
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10380 bytes
SHA-256: 8db91a7e1c3d53dba3536c53ba6e7dcb790ad0dd5572dfdfab02ac8bb3173fed

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