Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d6f718d3669739…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 23:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1097bd9df7ad87ad300ae83142d2179 SHA-1: 9f099ed7d1352b22c318824ee8159e8322a1c39f SHA-256: 69d6f718d3669739c3f0f978b6ac12f089f22632073f6638553e0c0625b596e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16152cb14df74c---welimalobixakatopakif.pdf In PDF document text
    • http://tuderprogettazione.it/userfiles/files/41983440014.pdfIn PDF document text
    • http://ibb-online.ru/f/file/31245034809.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/pofazululigapavoxafitas.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/wixufukat.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/moposadulakazi.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pibipenegex.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/54203983169.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/wekureruzabe.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/wumovuwofomeveka.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91978643046.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/veregisir.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/rezelegafo.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/37439836035.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/43652937655.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/86871106464.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/86697325911.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2eeb619e0---92613194650.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/mudedisuxotosubenabejapi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qsg222r95o72ssp6jfppfpjfud/linasifitixexudazib.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/84475468833.pdfIn PDF document text
    • https://pt-joker.com/contents/files/7625429567.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/jupadixuxadipegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=epoxy+resin+arts+and+crafts+for+beginners+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_off0000b635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB635 17216 bytes
SHA-256: 661129f8709aea09becba0bebe9573137fae9195218e8a8e5ec0e7dff1fd7e9a
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 11088 bytes
SHA-256: fb616648b278c3903f9502ed5ff5deb4ecfddab4e9ba5b7cb5a38e4f157a33c4
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1