Malicious PDF — malware analysis report

Static analysis result for SHA-256 807e4233dd1e6a6a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 19:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b302d2165f065536e20894e51c86477 SHA-1: e08ee637a8aebc84240944218fcfe6d3f7b7ec58 SHA-256: 807e4233dd1e6a6ac23e2603f20e003d85218ef1e875e3adc3b8fd8dca0329b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains numerous links to potentially compromised or disposable domains. The ML classifier and ClamAV also strongly indicate maliciousness. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=how+to+watch+the+fight+tonight+on+firestick PDF link annotation
    • https://ckmandarin.com/uploads/nodiwasosavif.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/kadirikew.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/tidirubegadevexib.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93479a3ac---39312892997.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nuvaretimukuviniloji.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/sapilegufatedefupe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1ff75486---3006211416.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/72110112170.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/dotaparajiso.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/93342812089.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pt994e3ffd49gnibvcm2176h22/sawitawokuxu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ef3b17c2a4f234de275b2044f1947e4/43790565681.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/baloxanodilonowomog.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/3655989017.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/10986839471.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dokavunevebugitizipig.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901144851_i0vbkz.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/89314311756.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/62978185873.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/penenumijaridezerogum.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/miwarabefafogilomopira.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/34253974490.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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 18612 bytes
SHA-256: d3161b433ad17144b04925cd1d64d42fe10d9b36870009f2d0a771cfe4f23109
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 10736 bytes
SHA-256: c99b80c9b5cdc93c78be616a6685c0da8f8c4f4de532bfe47a654ca5c20a8222

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