Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c57f04981531ac…

MALICIOUS

PDF

91.0 KB Created: 2021-09-13 10:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e9161ad12b92faf79a1802a74a5c4b6 SHA-1: c2fc5afe8c3970d2bdef92666ebf4e2bb3200b0d SHA-256: 59c57f04981531ac81428671031ef648df61c23a91a48604834e06577bac563f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable binary data, indicating the maliciousness is likely contained within the PDF structure and its embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=dream+league+soccer+2021+gameplay PDF link annotation
    • https://mamalight.net/business_school/uploads/file/bulepowetudavek.pdfIn PDF document text
    • https://fond.ru/userfiles/file/41598671084.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/4165784362.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91ce8fac0---rudovuwawunan.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/6462745927.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/devisufutanobaz.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/56413810662.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vofid.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/rufamoxi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nutuf.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/jurufuketewinobesog.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d281be93---2773154378.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/83983881706.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/sevizadiwoxosusakiz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c66cc2148---folusovesunowax.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wunuvotutizarexuxexujimat.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/94422990008.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/60701101989.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134146a0f2f2---35950776978.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/jozipagajus.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/51959425428.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/81028403021.pdfIn PDF document text
    • http://mcutech.net/files/mamejugiwimo.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/20499151161.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/dixifakejudosofub.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/92541233278.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_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 10932 bytes
SHA-256: dde612e15d89160373f17e89c11373783f9059e5720875ba9cbaabc2af20f5ca
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 17816 bytes
SHA-256: faee7da894e22f797308a258890710cf9b8dd5452d61240ffce137505e854314