Malicious PDF — malware analysis report

Static analysis result for SHA-256 517cbdf3c03c3062…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 14:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9afbf0bbf4f852cf28b78eefd82a2fb SHA-1: 79c047f0a9ce609091c8c1039654ed3c4383019c SHA-256: 517cbdf3c03c3062f5ef865157d9a92940e6dab662367a4ee88ac5dea2bda9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, acting as a link farm. These links redirect to other PDF files hosted on similar compromised domains, suggesting a multi-stage redirection or phishing campaign. The use of link farms on compromised infrastructure is a common tactic for distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6479f9849ddc0e63df77597e99378ecd/tofagesirazafevukaxo.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dtb3c59inn5hdiisp2gv0c4ru6/487360389.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/59811e8fb571072dbc613b90070c188a/zibejobarexe.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e298d05e8---wuzederigomixatige.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5516cc138---gadowoxuderadolegef.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612171e631d26---zeluvisebalofaxekogesa.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/28690768496.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad864c705da---puxizunakulepafebisu.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/mebafikalupoduxir.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/sotipimaxifaxamerevajiz.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/n2r18mk9cmtbp75bnn3vh1cike/farugavus.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/56701715579.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/3461118178.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210703054829.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/25496356643.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108261802268797.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d3de0fdb3a73462120df3409f52f52ae/beveganilugoba.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210802173145.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/50349346522.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/75347726652.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a355208d1---83415898882.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/53799919091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cloud+governance+framework+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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 10980 bytes
SHA-256: 4f508df7966a81f54f7b286635504c174d1c6c8fc3373da0546c3f3db189fcb7
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18704 bytes
SHA-256: 1b17ee667c3cd05086daf812a40d3a6880947e48220863e36936066276538145

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