Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef8efcc3152349…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 23:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 52e7eb950c0ba5b7db40c36e59fe72dc SHA-1: 4e4c6c83a0fb7a4f4f81fb9028be01b8a29670e8 SHA-256: b9ef8efcc3152349fabb81c73ff45b77bb0b507d73ef2e571dc895ad7bab77a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_URI heuristic confirm the redirection attempt, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=32+acp+wadcutter PDF link annotation
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/95353885446.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f28a2f4a48ffa2da2b5040c99987cc38/befidopolexisuwuwid.pdfIn PDF document text
    • https://mollis.rs/files/lagopezokededab.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/22459233480.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161572adfa3b8b---jozotugagafatikarizapafe.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/vifekonurenamim.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fatapiwojigodifupiluse.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202110011346091873.pdfIn PDF document text
    • http://metabolit.ru/files/file/buwiburuzevepe.pdfIn PDF document text
    • http://futboltotal.net/images/files/lidisaxupenudodosibu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/5582131651.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210920013305.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20957ec0---90804093972.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06afcaeac29eaf1859553c1cdf6b66ca/tubajevimavajovopomiguju.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kelamejafivufefixezu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a7c99b12---xisos.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161543a4f7db5b---48201807534.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/diwawusonujajefogajiloros.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/63320466855.pdfIn PDF document text
    • http://nktrading.qa/file/files/xuvuvosofubewal.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/54110220109.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/kosudabapugazevezudagutod.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2f98c4a2eac623c9989664625f04fe9e/wejonerimefefedivi.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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 16292 bytes
SHA-256: 46deffd9aace8d173a6666d3e6bf12610388de3251562eeaf66742ba6f35eccb
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10356 bytes
SHA-256: dc0eb198761bb68cf3246e1f546783e6852e8adccb9401eb249f0dd019701a7a

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