Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5b7a13d9957d59…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 06:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ab2d4037fa6d0a03aebbc576e753db9 SHA-1: f4cceb543f37892b651c513dde0edfd600249c5c SHA-256: 9e5b7a13d9957d59a9c921591a1c1d1ab83925f44a398a08d6af4085ba7e33bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=tratamiento+de+rinitis+alergica+en+pediatria+pdf PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/99869364333.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/83050183568.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wumomewur.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gakalawanubawimodamekekux.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24831192827.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/1895255400.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c1479966---63018716791.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf5f157e2---14414278877.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b89e9aad8---83649863113.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/74356569221.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fisiluvadu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d52b35ee0---zajotomonunelaromutino.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4e5eda1408ebb6fc9bd7e19c35d549c2/28745221479.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072575f85840---zadikakunodinazulo.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/nokal.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/gawujefizig.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/63430855407.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/29390612993.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/70269666259.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/27724717107.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ca1c96c5bd9b42b7a121e9c9b7cb312d/34436147346.pdfIn PDF document text
    • http://myredm.ru/uploads/file/gesosilimekulafegamulis.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_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10928 bytes
SHA-256: 841b04ede6e24065db852c164147aeebd3eec865ac39a899c528b1cca7706dba
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 18908 bytes
SHA-256: 0b3bb6c715e65a3bb395a3bf9095d9b7e98ffdcd76ee67a0513056d5eae15d6c
font_02_sfnt_off00014cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.