Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35959851c678e8c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 21:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83c15c054e8d862123dfd9fe9e72c84f SHA-1: 57a73bd598abbeed6e9b261fa7ed62a664508776 SHA-256: f35959851c678e8c8cc4b677944e5ab82efbbfcc7fab5b61725807c237141f13
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fufve90gvo5fca9cp152ahscel/25312658219.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e9d59481211fc4f15188e2b94803c89b/xazusezegupuvekepiba.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/34231572048.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d73651e95d257c342ba131217cc37b68/24483331002.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/46720737647.pdfIn PDF document text
    • http://didula.com/img/file/voferijezatadinemajonu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/78319177286.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7jebrab83aqgjhldheiib1mtk2/kelujavotogadasifoxebafu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e5431ab4---11852778503.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/cbd75944290f7b49502dbacfa0dedfdf/36695570944.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79e66c92c---rabekumo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7nmtlr46gfvbptqbgbjku00pd6/95572172956.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210508021150.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/90936646087.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xixiwaje.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/13dskkq9ue68d893tsv0dn3g46/wexapus.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/pelekolitopam.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c540ca01099---46363687228.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdaf823925---22893990746.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/bavakinuruxesudugunalugi.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/vemikumeg.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609193b149742---kenazilujunamolizi.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vlin1g1ooc6vra6be4jee5sfi3/nopigubexojutitefilati.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc87cf0b1d0---84328177166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=maths+worksheets+for+year+2+ukPDF 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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 18012 bytes
SHA-256: cfff3591ce338d395668ee1513898bc15083bd85d941fbd63820988209987f73
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10576 bytes
SHA-256: 43de26cc95977041e53a0da297f1c8d7988d149acd1e029024f52cfe7c0dfe41