Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d8e4b5935227db…

MALICIOUS

PDF

84.1 KB Created: 2021-08-29 17:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12884f69bf25d39288c0c5b9565740eb SHA-1: f7642915562e803b7188d17e1214b78aaf617415 SHA-256: c0d8e4b5935227db69e19a268184413c3892fe823dcb40afe8455f2740873fc4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded links strongly suggest a phishing or malware distribution campaign.

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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd2555dba---79452113271.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/51881523592.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e5141db229ba282b1acd9e02376fd86/tevegibaxifekidilikub.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wajuguxeralozaz.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b4ea846568fb895f8a637bf16d6b11af/86458712505.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc2dba507---72905847036.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fc5854b5aaf4bc54699270091ce356e/49797098372.pdfIn PDF document text
    • https://actorconseil.com/files/file/supipakatipuv.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/wonobivijazepoman.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac745c1770---73820456736.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/labozo.pdfIn PDF document text
    • https://profm.hu/files/file/55464502536.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/kavovemubexasefiboxid.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ed4e5dcc09674c3f2013009c012b2232/badipavojopobegivusax.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625106413.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa5ea2c55---kobugumoged.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/rudekap.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/2533089922.pdfIn PDF document text
    • https://deepex.hu/hirek/files/pedegoveguranubexunigiwak.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/22456458678.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6osnsnlnqes2thof44bneqvf3/tonadefilamiragezerix.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/fixosidoxoza.pdfIn PDF document text
    • http://pneusmarene.it/images/file/45709356693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=calla+lily+turning+greenPDF 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_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 19940 bytes
SHA-256: df999604175e446ae8cb05d20ece29c118f25b2b7bc293de0b911b936aa1b7cb
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 10240 bytes
SHA-256: a73224bbdfd71e12c28a8445e2cce19c56995d18b4fcd80ed4326f2347eeb444

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