Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8509d3a6e5e1bb…

MALICIOUS

PDF

98.1 KB Created: 2021-09-02 05:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9261dac352e3e425ae6f6b34c41adbe7 SHA-1: 228abc66f8689cd21ce9237013fd2d1ff49fedb7 SHA-256: 8f8509d3a6e5e1bbc4add81e8a7ee9265925a7abd7b5b8dc5f0a21bb0854505d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16091531ee508b---difopolunudaku.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tofanog.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28b3e05b597c0d8356d2bfe214c26084/60980222823.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/r19damvvuv2t7ii0sp787jg9tf/renetelupuz.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/godumepelej.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/7fb06ac7a2016a5a6eafa3e67bc24da2/xuken.pdfIn PDF document text
    • http://linker-apps.com/files/84121845117.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/sujofebukoduz.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2090390d95b9e610ab0151735508d59/1383401767.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/lolafuxefafotipojov.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/silasakulapawegamul.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607336af421cd---89613734791.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8892aea4d23749c419560299aba5eea8/bamenunegotoredodanig.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c4c63e287588dba531985add8ed06ff3/7394701222.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/majebuxasudaxomerefotedo.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/41078271948.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48dbf34771---gigesugerodonoludesi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21b01d870---lobilekaborogudiwazux.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0f0cf2baee9830d7eed0367cae388bdf/pikikexikevalotirisani.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/41458562537.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wizokamawuvebul.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20113485097.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/56190943441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=4+contractions+every+10+minutesPDF 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_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 17796 bytes
SHA-256: e520bf3dff8041e9e453a9ea140182527fae2723c4a86e5d29ce81de0f5289b4
font_01_sfnt_off000148e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F9 10780 bytes
SHA-256: 61aacb2da38909b5ca9a08eaae27406be94e740e219d7affe33b4abc5dbdb72c

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