Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6d2ed99f64b4a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 09:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8cb43edac3ea4fd3490b795d177f411 SHA-1: e89ef996babacaf365d17596024c9cce9fb4c660 SHA-256: dac6d2ed99f64b4a4045bdf6bb9777949d4b469ed9eab1bbaaa7546053e2532b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations used for hosting PDF files. The primary purpose seems to be directing users to these external links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0430bbbc9---65382689355.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0e08c426c---65369545636.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/83683519370.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kedorivegixejumodanawelan.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/lolimebewabimuju.pdfIn PDF document text
    • https://kimcert.net/E/file/wixefobusup.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/55432803816.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/23907291868.pdfIn PDF document text
    • http://gabortech.com/admin/file/13893407049.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/69492654924.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wupifijodiwovesotux.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/68458706424.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff215b85---11967728556.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/233942535.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/lufusi.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/65820366055.pdfIn PDF document text
    • http://jarosi.hu/files/file/pifoxezepawewojaxujapewum.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/bomepurezopuwosijok.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/50602496755.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/lenejixim.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jakobos.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zavobavepidivesuz.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/26132898932.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/75043912053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tekken+6+ppsspp+for+androidPDF 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_off0000afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 14392 bytes
SHA-256: 4bdb4eea543422c4144006a515fc300c0bc238544cdfa854d785ad1d007fde69
font_02_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 10568 bytes
SHA-256: 6f386d4db96d1bd068005b3638244ed9f95ef14a8e01753ab8d739456ae67b15