Malicious PDF — malware analysis report

Static analysis result for SHA-256 45021ab4215b61a4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 16:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e4b6068abe61dcedd6f7b289205c835 SHA-1: 202315fb81284ad602f32a2af870d86c592444a5 SHA-256: 45021ab4215b61a41c42ab932423cbae517df9d350bb6de57230876740672b52
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://facilitymanagementassociates.com/survey/userfiles/files/36118878233.pdf In PDF document text
    • http://www.mab-solutions.fr/upload/file/mogawojunizavugovisomude.pdfIn PDF document text
    • http://nenorm.com/files/files/poxejosodigegodozuzorisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091884eb5842---patidip.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b43e4fcde562b1d2be94823c625066d0/51156246828.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/66770233493.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wixovakeji.pdfIn PDF document text
    • http://vodnik48.ru/content/file/mujixuzuxuzikoz.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/8732663968.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/zixanodadekuz.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/22104972056.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xuvusadefadivu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819cca859f---vimimavelexogokabudumoz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0103b87422---5349312504.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vaxufategoxarepimuxaxuw.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/jakenivegilipotutefenuli.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/63255679484.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/tulasutokukizug.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/478d8f457171e6bc4839208d5b571df6/pasatekupenifakobata.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072499552d41---xigorepekedo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609880139c544---doboderawimodagaki.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc6b90e26---30017120506.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d7c23eed---xasidexebajilomuvekolax.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/71112219292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=technology+and+sustainable+development+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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 15136 bytes
SHA-256: 0d9ae8da7fbaa2815c0eba40849970342cf168706691e65961ca0f531e71299e
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 11352 bytes
SHA-256: 4e434386a07ac3408e079b5acdf8e3371d9bfd6233c95d455fe5de9ae6b561a0
font_02_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1