Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf25f3462f117bc7…

MALICIOUS

PDF

78.5 KB Created: 2021-07-25 20:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96651598e030037cc2297ab5b7401419 SHA-1: 101fe61d58dd0db06b7de3070377921c062cdda2 SHA-256: cf25f3462f117bc7b547c5d795c32f2e3d6f4204281e8cc6c4bff04aa4c13d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ti5v8s9jsunhvnvev1a1fc0he5/49566355253.pdf In PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/kumimusekavemozenefapiwi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052506384647.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956e800786c---nivikedetog.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab02f92c1e---33843136569.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/odaihv0a87uf1tmhrg0p38sepm/bonojikilopepevibin.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081a962e4f79---nutotowedijaz.pdfIn PDF document text
    • http://deauville.ru/files/file/80983078419.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858955c5de0---dupipetazubijipuwinara.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079f77aa211e---roposijonitibevinodep.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xoxiwowakiseromewamawolu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b143fd822e---37746294042.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/jabasifimudiko.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3723bfc9a---87073652321.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xuvibuvagilafubopokuzik.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/95d78c219391115767c17f7c4874e744/83745352116.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8c37a4e2---39794666773.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0f289bd9---51501428517.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/75023184070.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/58398478311.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae33947a7---wemigosuwirov.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/sijit.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/68343410172.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/10292565464.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3179c1518f24c6ebbecfaaa0978c81b2/76047720997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kid%27s+box+1+second+edition+teacher%27s+book+pdfPDF 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_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 11080 bytes
SHA-256: 3aa90a0495c5c70c0b62ac0813575542ebfbcc43200a043c757ac400ba4572f6
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 20472 bytes
SHA-256: 77d2883bd1c23877644d2fffb7090f35ffa70674d215b7a379bcc8425c207aa4
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1