Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d45cbf7e97b209…

MALICIOUS

PDF

95.4 KB Created: 2021-07-25 07:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9f1d1bf861d53ffd607abbf9dfb8d47 SHA-1: bbf173675be2e5ef8091e4e959a6eabae293c968 SHA-256: f5d45cbf7e97b209b6fcec6f3ecb0f6b2f357c5ff8f467e00da4febbf733d300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4pnqa8d6184l35sf1ttrb7nbv2/fajiluno.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a762332e2d26b4bfa173a8402e652aab/jadujilazixovivubame.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4217c24e5---88469146120.pdfIn PDF document text
    • http://contextuae.com/resimler/files/nexobibegiruva.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e650cc946da---68692623796.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a238547d2e---44891188646.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/kevapijabaf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/58d458sr6rk3skr4kstk0mrhor/kowetadebatavalimizufu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zavadapilawewemak.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/46090556754.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73a9ac352---72283957509.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2a4g1s2lc49knl372jpm6n77o4/97274855011.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/86f361129f0f45f7f0a1590ab7d23336/zuvivazez.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sevuwexeza.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8k92hrfo0p3oi62i03bu6178d0/85984882553.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/49a1a64bc651f9bd4913af7a42ba7ff7/25653697338.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/bumuxakugapovupela.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/patamabofotemobanobavubis.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/rugokob.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/semigatuzizitegitase.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3226b0eb278db8d4b23bacb52baf2404/78616019418.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/55533350057.pdfIn PDF document text
    • http://belovosushi.ru/files/kofemimoviwiwemuba.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/290748fc3a63e4ff736cc96ab7878c58/wifibaledirisowibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+relax+mind+from+stress+youtubePDF 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_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 16972 bytes
SHA-256: 18ef39f80ac27bc4972b8d8e1dc1b80a54600e0125ab9d32b1f0f3f6855bc1e8
font_01_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 11048 bytes
SHA-256: 70a43d887f8263a9699657e95bc87dfbe2fc200741184ac67d83220ce3172909
font_02_sfnt_off0001571a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1