Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83cf0620103499…

MALICIOUS

PDF

90.1 KB Created: 2021-08-28 12:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 797dda2cb70ac01c7da8ac4c6cec4b62 SHA-1: 63b11e71054bb8660e2071025bccae5e1af47c42 SHA-256: 5b83cf0620103499bea7c2c0ce9936bd344c5c6867e6bf2b9b427a24e1eade81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

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://philabc.ru/uplcv?utm_term=each+moment+is+the+universe+pdf PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6ksk3ncbc8bpb0e0ln3d1fjo68/fufezuwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993b6edd114---86571173995.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/ziwizajofonoje.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/47633890036.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098771e4286e---nisikax.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607232356b59f---xutavopujit.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/86787215513.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wolus.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/valinevofuka.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dizetoxalojirakinabobamuw.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/umtqjo858f9v2vkkqbp0ff500g/47566289133.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/67600619252.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/vavekasekejoduwolov.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/toxuxoriwozarepoligowol.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/79825772555.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ec72a2631df50f52ab79fe59e62a1f58/79102805961.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i69aia3orpts9jm43lk4vq5lae/24130900748.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ce7674a19e68b1c27c8f3357ba0227fa/15438745614.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/43206360268.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xonaxudupuzinokeramun.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089d16bca688---53277100603.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/jofatokulutopimodazed.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_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 17336 bytes
SHA-256: 27b66ff394f32ca775e32bf9fb2a7243f9f0a50583d683da202fea125ea694d5
font_01_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10988 bytes
SHA-256: 5199e5c4d92dd707be7a773d1426302cffce309b5b8556f771ed94757fe11abb
font_02_sfnt_off00014282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.