Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8760c01384309a…

MALICIOUS

PDF

116.2 KB Created: 2021-08-05 14:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb3fc36bb9e64e0165e1d7cb0d0ebe7a SHA-1: 10b5fd5c730ac114fdb2c3d6978e02a15d024055 SHA-256: 0e8760c01384309ae0f827688df049c8182972766b82e5265b82d5a3ceb0c0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://interel-rus.ru/test/sites/default/files/file/6201118538.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef0d488c6---fudumipoti.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/227f9d531b1aa939afbec41997f5cb44/83034217656.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/nunafovipotezarivatev.pdfIn PDF document text
    • http://skncn.com/u/files/sosovepizokugukositosuras.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/42898296840.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/66203114913.pdfIn PDF document text
    • http://sartor.ru/upload/files/36090128813.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eccfd9638---61631987625.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/88132671874.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2158719df2e306d225ef0330f1767a43/78713490505.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/89410500743.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/3367100327.pdfIn PDF document text
    • http://surausa.com/uploads/files/64883720659.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/67808614318.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64aaac295420895a993b636e3e43c9e1/befebafawubamurusi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8d854279---fenodibon.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/ridezerorenoferiwuxesug.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/salide.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/8938668268.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/meluxirupatup.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/rikomipu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/vatozexikajerorupolixida.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/94jkdp2m6o3dl8nat7he1ca2r9/67128003176.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/21678256794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+adverbios+para+primaria+pdfPDF 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_off00015ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE1 10852 bytes
SHA-256: a7b89abbab49cd40531c5a9d49b65d7da8757d4549428b9833c6d4255377d00c
font_01_sfnt_off000175b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DCB 20176 bytes
SHA-256: eb085e21c54a427614ea5d5f7d9cbab96b3fb26d53b70619522350ebfe185381