Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbbd5bbf57ac18…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 09:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d69ebbc1bf933cc5ada40b98267897f SHA-1: f3d3a4f4245f8aaef3802a5435d3cbdba5cb60dd SHA-256: 79cbbd5bbf57ac18496f39dc544ff4e96fa9d58b34adb305176cd97a50b300de
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The presence of embedded JavaScript and the nature of the links strongly suggest an attempt to download and execute a second-stage payload, likely for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=sullair+air+dryer+manual PDF link annotation
    • http://train-in-japan.com/images/blog//file/76560976342.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ob40gbmjj78pujh0qv8fpvec1j/39066710793.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/likepubibitukuwifes.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161288e4396c1f---4083762325.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3is5ocurm034ts7k20k3kou22j/rutagoduwo.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wejube.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gnfst4gq3fve4v3cmr8t3smim4/74372505023.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/166f0abb1c19a345430e5f4c248f4d8a/90318152437.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/87042395058.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fejojafol.pdfIn PDF document text
    • http://fitviewer.com/files/file/14763741389.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/070075eba97a3d5dde28b7e912ffebce/23530017317.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/88180329603.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rezegarefigoj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/22c7406e69d0bf59aac3b8d5fc15b444/83350689946.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e0a9965da---fesozamisefekevifuxi.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/sejaw.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/62b7156cfd837bfffdc85755f01023fb/nuxuzemitewonokov.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/xegatefemipaguwigemexam.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-24/20210624061622802864.pdfIn PDF document text
    • https://capecoralliving.com/media/file/6062395243.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i1vu7q3flnstfab78l4p8uv63s/zoguso.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44280255272.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608483fcd5a1a---dafitadafuje.pdfIn PDF document text
    • https://artenika.pl/fck/file/26964857724.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_off0000bb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 10312 bytes
SHA-256: 8c6b081419ddc95ecacc84dc4ac18a1dc2b5b38a15a15615e1e4648e1e9a68b7
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 17424 bytes
SHA-256: e25c4ef31af242df5698d151fa4a8efcaa616ef012b357a513655968d4b072e6
font_02_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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