Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cc0a611fa6f048…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 10:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1212fd07f4dba6c62a2f02268592c90 SHA-1: 378ff250649541c1286783efdd5de9f09fa86b71 SHA-256: e1cc0a611fa6f048d34aba34d34e666dfee2a3a2f53f1243cee23223a349c1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://ketchas.ru/uplcv?utm_term=i+want+to+download+temple+run+game PDF link annotation
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/vigaxeponididuxemusid.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/wiwizibamemotepuxoten.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fasaxugux.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/dogitasemolaxifota.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/wokegube.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/21862234679.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/68919734745.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/895h69ujuj6hqi3bb8a16ehr7m/67355793090.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/92435908706.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/wibovopijivuwulabixejafa.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/79797113045.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/gorukole.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93489452145.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4fb03deb85e6c898708fc32f4da62f56/54517809611.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210905_140433.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/83509361929.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/15856458419.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b640f24fcf3fb616d486dfaf42e6c203/56944226364.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/87653702464.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132674eafd5e---firilokelorumedu.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • https://ms02bet.net/contents/files/65600983556.pdfIn PDF document text
    • https://foulardfotografando.it/file/gabasunajigorot.pdfIn PDF document text
    • 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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10612 bytes
SHA-256: 8282d59a2d16dbe48cdc2fff9b192bcb62a570431f7c4da6e01f4f3b3035f4c9
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 19280 bytes
SHA-256: 90d16444154e42ee7ddd4d3df662ed891398506fb9aa55d7bd90956ba9c4f2f9
font_02_sfnt_off0001382e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1