Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5dad730dcfe945…

MALICIOUS

PDF

73.4 KB Created: 2021-06-18 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9973e2474ea60aeb911bd7eb28ad7561 SHA-1: 127546725a4b962b194100e9d2d94e299ea21c57 SHA-256: 6c5dad730dcfe945ccd9fa74ec7934022f2581c7c3338f2c73c499cec1382d9f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mamoxumazimawad.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874dce9d57a---geruwozivuzulokalawuxuwu.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/slaihaejth4klb1p19kcaaf5h5/82776853069.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3f693a90b79d1d57f33179daa7a0551c/88056498899.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a2096abf9ed9c988043b7119fbfdaaa1/gabunotuwidex.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/filebawenedegi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7519467dfb---rikiwudebedozazidi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb2121e50---37343692283.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/65165588127.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090876685070---23617131677.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/savasodoxijosekubo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/xojosezutotoladovesop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clash+of+clans+unlimited+gems+coins+and+elixir+generatorPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 7840 bytes
SHA-256: 2b798283d3683e85eb35a5abe21413cf160d6019219bec2043eb0624c8abc7f4
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 3460 bytes
SHA-256: c424cb45e0a8d0f26ecddad5b5a02109ec098bd6ac4f1f0069697e6a3b9e2d9e
font_02_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 5408 bytes
SHA-256: d8bd48d753761500d0d498c0351d323d8fd53d4ced234471c7957b075c5515fb
font_03_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_04_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10344 bytes
SHA-256: 8780618aa5cfb4a55706ddcfe235ab45fc362c3ca2d05d488fb43a2116176fa6