Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe232deb49b3b81…

MALICIOUS

PDF

91.6 KB Created: 2021-06-14 06:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f5426222ea85950c111357dd9d13f6df SHA-1: febd46bbb2494315133aa69c01eaaee28bbb4de2 SHA-256: bfe232deb49b3b81edb0618ce742c90141993feee8f7bdd0cff22d7feb6d79b9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of 'LOLBin token sequence in document text' and the PDF_URI heuristic suggest the document is designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/uplcv?utm_term=minecraft+server+hosting+free+java PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9938b61c41---laramizudetum.pdfIn PDF document text
    • http://kfbi.ru/content/file/258399816.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2420544d4b4e409517ae38aff07cca50/gofelukokasi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4e03f86---4428805603.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fdb2t7cv4ce79pumh1hlfbcg2i/kunufamigojawuwipisifaja.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2ab1qm49bsc3e7jcmdc9smbuj5/sivolexovi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607debcc92027---fezekavezuxuvuzov.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xosalovuzuwewadi.pdfIn macro / runtime command snippet
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01e2ec076---razufegatujizukonezoj.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a7b311ca5011da36c0b4ddce7a9e648b/28809544121.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d8de2e21---42619468566.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/benafedigukixixudag.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a642fa1e47d---wosanaralulufufazejix.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8134db361ceda467229f0b934390a68/5313646089.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffbb7f5fe---50516238513.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eff40ae52129fa90009fafb28ae9b46f/sirazirojidomaganilus.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xubulodozofuviva.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fcjq34vc5klrqicc3el64tdkai/kunibolikelasipunabesutoz.pdfIn PDF document text
    • http://constructionone.com.br/wp-In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 5040 bytes
SHA-256: 09ed55f07e968bce898fb9a3f8a4a920594fba2db4d918a06d2ff00fa6a41504
font_01_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 11616 bytes
SHA-256: 957ccbba0898ac06736adc78e69c454978c37afcb178c2c8bf90775f935e8b8e
font_02_sfnt_off0001535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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