Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb15196e3c2f7e0…

MALICIOUS

PDF

83.9 KB Created: 2021-08-09 23:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a8f832229b48fffeaeff2ef71981dd73 SHA-1: f952c05df9702ea8aa2a3e7c3fd1c3e57091d9d9 SHA-256: 8eb15196e3c2f7e07fb0c46761a65a426ff5d474a4fee752ade999664d35464c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/eb8830604c802a43383dfa1d99c2bce4/38486277720.pdf In PDF document text
    • http://www.blueoak.fr/image/file/bomamosativeri.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30b519062---82936494651.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d87d5858a---35645567232.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a0a6586ca871c81a2d99d4ea0b7b65f7/20045935474.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/44872639328.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acdec29a403---jakojuwip.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/39100704972.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/44956609058.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/89bb92ecb6efafa6d68c3624052bf9f2/1904537727.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/49654881072.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/8945037543.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc884632dd5---84323695413.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/lenexemivarevuronur.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092464994b62---57015135690.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8176c9b78f375d546f6944bff1b4f651/95654426872.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/37349484205.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/potopesokemirerapififuxa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6131ce3a---lanogexuluso.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/gapifasojovalan.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/tilamamepupakoli.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7f138celpp7sdlsmkfci1d2f0/nevajexenoganokuxofadiw.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zawaru.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/10617662269.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789e44d20aa---wuzujam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=el+significado+de+sentido+comunitarioPDF 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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 10904 bytes
SHA-256: f6fc3df4a56147e9077a37ea663682d91a68dcd56e108edf668b45072f11d8d6
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 18620 bytes
SHA-256: feb3cc2738c6340f82fa76e04363bd8f0648d22824695dd38313fcd52e02e6f2

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