Malicious PDF — malware analysis report

Static analysis result for SHA-256 11db733f57ba70e9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 10:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7518cd778015946a80bd2f0ff1090ec3 SHA-1: 343f62e69c4b34d643df5a629e908305082fa55a SHA-256: 11db733f57ba70e9e1a3eb280bf3aecdff8269539a9c30d96251b5664e31d3a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/faba265315f5fa84ec0894449c6237e7/ridugakogup.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa29e98d1---12771991823.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/lonapi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/44842578913.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/16575261510.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/68qj3onlcv4fp56883len7fek3/fugofebatatixotomi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6c6c08acc7d68ba7661551586ea2ed24/83981203596.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/11217204326.pdfIn PDF document text
    • http://orem.mn/uploads/files/kamugerojagofexadibate.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9d844lr0jfeq40qgn1u7jk4gpi/vipazosedufit.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/90670013756.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/70201838692.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f0e827693d22a4d719a06dccf8ee0ed4/31496177637.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160834a81e7e0d---89182141048.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gtfbe3sl8d2elj1idkisfuliu4/japivodavirobidi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/008611fed80c49cc45717c04b3eda321/43911827508.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pivamirij.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2dfbf6d7895993e701efb9422c422172/kubimevevezaxapefa.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/58405338238.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c06caca82ba---42131533529.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/83a0bb4f9d958b842ade0bc073dc900b/80818161390.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/34182234171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ijoy+motive+headphones+manualPDF 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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16984 bytes
SHA-256: dde77ac27589045ad2983773681983c2f80c5e14b611abf653c9a48f592aa23e
font_01_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 10916 bytes
SHA-256: 967a5d62fdec3a42927f2b90fe1052482f67e97acd60177d5d1acea68bcb280f
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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