Malicious PDF — malware analysis report

Static analysis result for SHA-256 5428364331465144…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 10:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e610cc7f15fbaa2dbc9c8f56efe6fd8 SHA-1: 151dfe4bf7ea6b9c38ccaa8532fab5aa1670da18 SHA-256: 5428364331465144f434be37cc9eeef29b586afd9a6d8e54777e611870a40077
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=what+are+viruses+in+phones PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49701691209.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/78487176653.pdfIn PDF document text
    • http://dalaichau.com/files/bisorevubefujagapova.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/37681745077.pdfIn PDF document text
    • http://aa-nusd.jp/38402543971.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/muguxikaguxadog.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/64133840136.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/35964003456.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/vanakonisaj.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/nifexu.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/77420124990.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149dd669e8bf---6027023620.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3b26e249---pimet.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/rumusulime.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/20145794715.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/45639147973.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/39670970068.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/75317359498.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/babosagu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/laxugifikuduripefu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6570acf10---34128124251.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.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_off0000b8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CD 19052 bytes
SHA-256: cd58791a2f64044189ea14616df574eef9882ca79a16f935a70627ad3772073f
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10460 bytes
SHA-256: 9ad46a44e6746345a2b1d5bc9bd1cf019aeb0ef2acbae3d7b0fccc6895f5e45e