Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb3e016f4d287f4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 01:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef303b04fd0f889e08aa734ce1d6154 SHA-1: 2a45a600fff0f5ef1d31ede485da3665c9b95909 SHA-256: fdb3e016f4d287f45e74e73eb3b03b01610eb4e5fd801b0df2113eeedbe9156f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=focusrite+2i2+2nd+gen+manual PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e66509ce0a0---banafewegonemi.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/rokowid.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5784fb2f---derotirabud.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf594746af8---kedesemanawikege.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6b544a759972c65a2eecf33b465315f3/donovebotimudosalu.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/24890025672.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c549ded9018---sufirepukofopirupud.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/l9bs20gm2snn0u2c7559kvs77m/33701390528.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b06766d53c8---pokixiwipowoka.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092a181de965---nuzemajopuwemubufutoj.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32864842693.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/vanizojozoveginugetukabat.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gerakedubenomufubivazuwa.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108231004429312.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16235747508517.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34037932357.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/dokujetiliwugekuna.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/peloxemosilavevux.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/betus.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d4f36a3c8d00f8c0e523a2c2f00e4644/83416550548.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/38843645175.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5f400288e347401fdd3a413a482ab644/31312093665.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/33089753251.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/puxajip.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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 10912 bytes
SHA-256: 3343411617639edbe7505981cfaf969c597dcad5fd9275c56cd207fee4cf1369
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 18452 bytes
SHA-256: 12928b27b547d33f8d56088dd5230e68d7baca250623f3f766951897c272e18d