Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5fa423eb8837c8…

MALICIOUS

PDF

73.3 KB Created: 2021-10-19 18:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42d4a353f26b81a40f2e313174703c7d SHA-1: 0c409f45a8b22636f059a19c9e7eb6db94750d33 SHA-256: cb5fa423eb8837c88ac5b2e406159005ca3fa7939e5d489ac5b0ee333a89c376
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, which in turn host more PDF files. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier strongly indicates malicious intent, and the structure aligns with techniques used to distribute further malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=diccionario+jur%C3%ADdico+mexicano+pdf+2020 PDF link annotation
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/nufosowoxixadufopos.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/lenikudabu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6495fb94---limunolafotasosu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/jojodivetefufizeripubibiv.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/timuvisutinafenit.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/meseto.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/9532228713.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0b4c8410---86889980521.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ssg5f2dbvhfutaqre36gpri5qk/52411074218.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/be616de3dcb2a0477b9bd12f088547ef/29794795466.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/57832179171.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/58820406681.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/27550788199.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/xiniwofojimatuzatodin.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/tizewol.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/30428143361.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/28302749367.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/riwurekifilu.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/sotifulomowib.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kazinajorab.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1616df018e84eb---lumodajosevakogilijop.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jasadep.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/15307721765.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/26065480698.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/85137788030.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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 15808 bytes
SHA-256: cb2e6c14749d2a62b31329017b7f3ab3815466d5a68b9e87f5caf60136dc4098
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11108 bytes
SHA-256: d09b48b06c578c91d688927ae7e77b573b26751311c24bafdf90b1d7e94f8c18
font_02_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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