Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadf367afe773a95…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 09:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0f75c6a656ca75afe6c0d35b629f550 SHA-1: 0ea6ecd1cc6a671d145a17bf12b963c9e82d23df SHA-256: aadf367afe773a957d68541ad84e96cb2d7ca824dadfdc8cedb2f636895a2edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for potentially malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=han+v43+apk PDF link annotation
    • http://architettomontanino.eu/userfiles/files/56331467079.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109050542072697.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/fokaza.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/vawod.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138401da8d72---siwenajitukikuf.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/32112027805.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/66803709835.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210902030400.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/wegurulokexowe.pdfIn PDF document text
    • http://e-sheremet.com/img/43020091230.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/vorefikenaxakuja.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/131143336.pdfIn PDF document text
    • http://denge.aero/upload/files/17506207639.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/17959300886.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/zezujefimatuv.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/67327385056.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/50535043751.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/31784508559.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135068b645d4---91131674447.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/50010681354.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/motoxafarixuvuramezoxub.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedb8b3533---80913270718.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce82c5b87---bidilazo.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 9888 bytes
SHA-256: adf91d8f7c2bd6701d31450953329ab011ce7ce2b2faa52ecd34573715cc8d37
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 17564 bytes
SHA-256: 4888edccc42e394058cce2fecce6d73dbfb78a36f0308dbc9c4d99e26090edcf

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