Malicious PDF — malware analysis report

Static analysis result for SHA-256 6699a9d98e053fee…

MALICIOUS

PDF

89.3 KB Created: 2021-07-16 04:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64d825d7f33cc430bbda950beb3ac8fa SHA-1: 5ad941b606b48f824e0a6b53e0f1f037f18589fa SHA-256: 6699a9d98e053fee1c44ff9badc42ec1fafccfb75c7fdc6e6c57b8f44f11e4d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=importance+of+research+in+public+relations+pdf PDF link annotation
    • https://prtl.pl/userfiles/file/dogawin.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/nerunededigijakawim.pdfIn PDF document text
    • http://jucal.es/images/file/91471980968.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xapabaxiv.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/9713204889.pdfIn PDF document text
    • http://fedime.org/imagenes/18244215254.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/41002999569.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/tuvejinovinimigojusez.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jesinupezububadatesep.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/veag9o5bg1k3gukajb5h8koa41/3838505803.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503105643385220.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cba9b0a2801---59126774476.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/03dnff7f8elhfv7gme3tq86tve/26172079729.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/7708088359.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af147356f---36648227786.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60278598---19409378284.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/47466746719.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fd48b308e12a3286f51251ef774c131f/11437722654.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/gakagofedujigapoguwijij.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210613134659.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/414b2ec4180bc6c9838b9e0c31dcee26/bejedirakulowiteki.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/83495501796.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/xokaj.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_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 11076 bytes
SHA-256: b4e0b6f01574ea4a779a67f0c4a156c5b644d05982198a097978d6af9028df63
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 17904 bytes
SHA-256: 9ec6474928ca6e9e83f223362163c27b15e0895a1bf1ea7e49f04bac1d4b5ab5

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