Malicious PDF — malware analysis report

Static analysis result for SHA-256 d486545ec60c44e0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 12:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d74ccf1ac14ad1823cb3a7cd763605be SHA-1: adecb1fdf002af16c7536e5031a7e03c8a98d9a1 SHA-256: d486545ec60c44e08239eca1415bd5f1720eb7dcb3fc5cbd8580321b550544b1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.ftha.org/admin/ckfinder/userfiles/files/88742072071.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/19182820538.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/bujaxobufazax.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/73160993399.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/garinalikafojojasusu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/13306619640.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/78733275890.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/24505284951.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/wadanapenutiba.pdfIn PDF document text
    • http://goref.ru/files/file/lobamuvosexuxukokejoluwez.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb82e1882---98788605067.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/dowelewavogax.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fadd6381888---konumelofasariru.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gidebovuvodamuzugopamuse.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5742cef819e867cb4e6c9a61474358b6/98397193741.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d728b2b7---53143148211.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6136cb4654---pemejefexadixekudufosilex.pdfIn PDF document text
    • http://aa-nusd.jp/8156948167.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kuteforixogifikekepo.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/48042506558.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a91f8c054ee734681ddce06b642a9adf/46037859724.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/261753056526.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vaxaxosesiveg.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fojokib.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/47604380492.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a2jcobvtkd80m5qnl97k8kaisv/13622447582.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c45cbf3---7849297226.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/88725810b4433382bb718f17d515f1cd/68812102003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=black+and+brown+tabbyPDF 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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 16076 bytes
SHA-256: c27a709071e44be7e35fd45b228f7144722827e4e26cd75a5dde10f72860645f
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10456 bytes
SHA-256: 5a0cc80873f205994342ee964a4f1c515be7d07e00323934332878519981899f
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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