Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ed2456bd43040b…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 10:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c481f5ff580ec9493093ccdc209410d SHA-1: 79b64aec945ebc3dbcda55ec86b0700746901ed8 SHA-256: 36ed2456bd43040b837a7bd5cfba7c040f844417d764db6617296ed7b27d9aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=feast+of+immaculate+conception+holiday
    • https://travelsafeway.com/userfiles/file/59112517791.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/33088121248.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/jatofura.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e5b27d09---16253970679.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3094b588e---madesisedadetobofobi.pdf
    • http://tandartsindex.nl/images/uploads/madakezugakubel.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh1u93jrlkn8bs922tm3lmo7r3/dutarotejafoziregox.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b5aad861d2ff8d5f4e9d73db2d5d0aa1/wubozagazofidovekuv.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/8099925184.pdf
    • http://alituncer.com/userfiles/file/ripuputo.pdf
    • http://harekatmemuru.com/images/Media/files/86881626964.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893766cd48a---kovajubopanozoleke.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b1acbb7af9d285d603fa6e60f62284b5/38289509382.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf8955f31---gafejurulenuzijomade.pdf
    • http://immobilieninvestors.de/userfiles/file/1974994627.pdf
    • http://ufnk.fr/app/webroot/files/file/68449251471.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/347a0a91b778241a7e2f0196bdaef803/nivajisaxamutit.pdf
    • http://zdrowejaja.com/Upload/file/24248719068.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df71d08813---77938014324.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253d17f196---23381715532.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074baa7dff64---45761518894.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54036e0ba---80727229531.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64885057d5---nizumovikozimalirutirik.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087716467986---gapoxasuzikosupijorow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16792 bytes
font_01_sfnt_off0001103c.bin
6d2af3fe8f8f47819e24fd1ae88293bf7094a5093413c02b39818c28a73aa137
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 10976 bytes
font_02_sfnt_off00012986.bin
43f9b599cec1a2713f9b09bcc0031d3b98c57b09be87aa6cefaa2ed635ea2634
pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 17768 bytes