Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6ceb720bd72f6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 22:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6eaae0f0d03cea0fcb7aa00139ca0f5 SHA-1: 4a8869f0213a78681aab3ad6c833f666b7c00147 SHA-256: 26a6ceb720bd72f6bea03ba2a0da071e8e5c1a588df86447880b51e4f40064e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs likely lead to malicious content, and the document body, though obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1417acc88---minelakavevowimojilu.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/67069793826.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/54358382689.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mitokotapavidolana.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lidaxejiziminevabu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///moxifepewumowovimufatax.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sojevigovanego.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/95612713533.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/91857639895.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/dekibijarezekenejenize.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rorodurebewinigasudor.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b7509ddf---moropumenofileraxit.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6363104ef---paweka.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/81d5rp85vbh5gaojepij7g8112/38456927185.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/xovogunuwekara.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ca136d6f5f35d678a67aa1bfa643926/jinisako.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5ca28dfeb3bbb9f581108c4a4c19c31c/76881220614.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad889d539---26708646694.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/junipuvisiluniweriwakorev.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/74036672119.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/2i85065bv0hu4m6vhg287046l6/72891399283.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609917ada1f2e---97106879266.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d241f6b243---puzuwotanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kano+model+questionnaire+pdfPDF 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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 10896 bytes
SHA-256: 07aef6a319753a0cedf41c0460f38bf2b63f1d9e50b75f4a65d40ac651b0d2b1
font_02_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 17248 bytes
SHA-256: 15ad2bed1b98f3dcb09fd790cea508115163c1761e928dd7ecda018a734e18dd

Open this report in the interactive analyzer, or submit your own file for analysis.