Malicious PDF — malware analysis report

Static analysis result for SHA-256 26efb522c0c9d02b…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 12:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0db89f31bbe2af7c0432bb26f27fb079 SHA-1: 1f3f58aabe4b23a12e0e3e2caaf1d0f8bd4d4e1c SHA-256: 26efb522c0c9d02b4f7d8fefa17eb83736c3fb6fc05c25ba65a9dea8479fbe09
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs and link farm patterns suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=lesson+plan+for+motion+class+9 PDF link annotation
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/c9a88putsbkvvronegqnhs038f/pidade.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099efd3bc3f4---siwabugabudugapifiw.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/32723755867.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0855056995---xijegevazajukesadusugaj.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075690ee73c2---toxeki.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jezebetibuvi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0928ec7f0ec8a0158be115f39c2d216f/10555366210.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e999618991---rikusinidarakenonogo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160902b069c916---jelafapuwa.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/21003229820.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/81429959770.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/65621980397.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nunawofe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6288d4576d---85844386495.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac0c847cd---40054366704.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lefavosusogejabodolibofa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/55q5pe1fe7mnpmbj7o895ebag2/63298631933.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/sutexas.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fe7219e3---55409537301.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qqpast45uucbmdnqs93msq7tb3/ketezuf.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/puxaxabetokotekuk.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b022551537---48696403371.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/53949527229.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/88786916340.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16836 bytes
SHA-256: fb93d66e0c5920a97264302857b764909e8b48c16251d32a34940c368a7530e8
font_01_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 10764 bytes
SHA-256: d5cc411623fd529528e4fab589e306a92a2f7d339cebb9254e79987939172e89
font_02_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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