Malicious PDF — malware analysis report

Static analysis result for SHA-256 965164a32fe0c55a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 22:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 382c65695eff00cf0319e2bffbbcea95 SHA-1: 9f56c1017ea04f7b51043157703ece7e10d7dbb7 SHA-256: 965164a32fe0c55a9397a90bd51c829537a84ccbbfe3b60913af6d48f687abf2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external and potentially compromised links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pistant.ru/uplcv?utm_term=cinema+hd+not+loading+streams PDF link annotation
    • http://spellenindex.nl/images/uploads/64322328409.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/47449cf3842eecbd742c09f30eb02766/tuzefiwutepemik.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/zapasizububovu.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/32755966489.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109161047223462.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/77833277897.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wiliwipezidubisejosez.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/39484372324.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147eb1bc9e5e---mujigedokokorogudo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cq4rjpnedi77u1a79cvhs3p643/limasani.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/jonodabiditomavugimapewu.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/13025647260.pdfIn PDF document text
    • https://parfumzone.ro/files/file/65271274373.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/19934317282.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-23/20210923135055318019.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/41570080137.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/dasuzojonikunenaduvej.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/buvodudimebedewezuwut.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/ralixunuvirazab.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nufuwisogulaj.pdfIn PDF document text
    • http://net-work.cz/data/file/43487011853.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/49220966820.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/butefikenaxidapiwumepave.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/dunixefuwur.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sotorumaxilukafopifuf.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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 17464 bytes
SHA-256: 9c06342adbb8348ec41e52449f5ee0452dbb1d94223aa2650239e6b68434de44
font_02_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10728 bytes
SHA-256: 3ebfb317e4eb346c24f136077c650f4e622be4bf1c7fb6de24d6c10f43be4c6d