Malicious PDF — malware analysis report

Static analysis result for SHA-256 df53dda37c07206f…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 09:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f12593c1b1f06241beb36e828d04f845 SHA-1: 967e7c70b428b6f9ac051508c2c62bd2ad31d711 SHA-256: df53dda37c07206fc70dde4ddda5e7a96b22cfd7f2cf56c87b619bf5e274af51
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82387499e2---vizajoxokonobiguwisibep.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/09655fb3b9bb8f729f4def453e3ce20a/siwavazidi.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/ranilerizozigu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a210c7800bc---94991601083.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rediloxewibusudinal.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b82587f90---linulinipudilivon.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/paperititur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cffdb1d1b1d---zisixumebekazagisonixixon.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4a9627a5a---93949880371.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3f86b37a---76892454822.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/43294808167.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/16397236773.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/57961836088.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n9njmqh71egorfmrsrgb3dr17d/fululeluvofogiwumiwama.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc784e3bf---62425567576.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wujijatewamenamabave.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vaviwomalodepiwiwisamo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f0716043---42375646094.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0fa756c4---77102654982.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/tozidefi.pdfIn PDF document text
    • https://rintrans.com/files/99651058359.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e551e4811---lawelebulumiregodoremok.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae28ca97a---10711055050.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66c14901e---6809129172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+giver+chapter+8+summaryPDF 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_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 11004 bytes
SHA-256: 28061ef9226a3559d41eb04355f6e3fbd678136f932c7144e682657b7d0a6abb
font_02_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 18088 bytes
SHA-256: 97e36349936c3c790858e23578da00d4930ef5df8f03177f626ab3068cd2f340