Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a449eba44249428…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 05:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6026027d0c1bbe82244a869611cd094 SHA-1: 8769ce3d08bf6a4bdf4130ef1913fe68b07392a3 SHA-256: 3a449eba44249428b348432c6271342f103cc06b167f1d41a927e1cf0f20b43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a90365efc---4036953310.pdf In PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/begekovoxoxo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/16235888945.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1j592394m0b4e8p4j592itr67d/90714714960.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581571488c---30654960625.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/20864345288.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/wifigupikaxetukizelorenuv.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/44241871354.pdfIn PDF document text
    • http://belniig.by/public/file/kekilixawelutu.pdfIn PDF document text
    • http://starma.pl/files/file/39443200243.pdfIn PDF document text
    • https://casaalu.com/luutru/files/96242999515.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/68867fa78652f9e221c2f41ea3f49d00/nejifijufutokokomalufikag.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/5398916531.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0982cd1e9---wimojake.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/tozuwimolomejotuzavawera.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/tuwenirasesa.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/perozowurixupipir.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/98255240139.pdfIn PDF document text
    • http://centronegozi.com/public/gumazajerazoge.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909100537299619.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/bojajosururumubu.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/58781383033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+restart+bootloaderPDF 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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 10364 bytes
SHA-256: f0cca743b57778a27d573faa8cc98f94927c2a8c936a40b67fc403aa1afd67c5
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 17936 bytes
SHA-256: f011c877352d8f0ce7c3c21498b7f9bf0d9104acfa453d74829247125a2f5807