Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e5a55a1deb66d0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad5d0263445eb21c063f41b8e1bd9b1f SHA-1: 256acd48409598ae8b2a136b1408b387aee5feff SHA-256: e6e5a55a1deb66d08dfcf930c5815d890a34a93f727d43f6cd6454fbb0655241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external, untrusted sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=airdrop+from+android+to+ipad PDF link annotation
    • http://alpha-cp.com/userfiles/file/gawelunakolofe.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kexaxizoxeko.pdfIn PDF document text
    • http://sksound.com/userfiles/file/20416679222.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nobofilubesuzemodo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1d504a923f38c0198bea9cfd104b4959/lawulazaf.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/60903636602.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141786136ba6---zugogekob.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/kijifabobojakomaxen.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91976067383.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109060819181103.pdfIn PDF document text
    • http://air-ned.com/uploads/files/91384790820.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fb0b0ae---motatot.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/paruremikij.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rupanomavezovovav.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/tetixibebukawinasitafo.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151737042383.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/17094016840.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/2200717024.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/milamowazugutigemu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d84da1dbc---sebibomabapix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613891d79f25c---70581737305.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614230e91a578---23311895243.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/32311562452.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/nawina.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 10292 bytes
SHA-256: bc9ee93439b01f5a9eed25b2be340491c0d240cef03a184d6e7206115cbd16a5
font_01_sfnt_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 15052 bytes
SHA-256: ffd40c2c1aa85307f4ccd301b7436983c22acedfd64f029f8c44e5f4d5476aad
font_02_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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