Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f07591dcb593c2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bdb6c71c32fce0fc0415215b592fd4f SHA-1: a6911d1b3db583a2235e4ee1ee07ca0484475f7a SHA-256: c6f07591dcb593c2b1263d0f79d0810b2e05291f433a67a4836c39f20eb9431b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bobas24.pl/Upload/file/11974930102.pdf In PDF document text
    • http://hiddenroots.org/clients/19739/File/pitesejedesa.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mokosab.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/76948912251.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6l6iajn1v9btuq1t8u2vj9c3f2/wovun.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607582027ad8b---sinipij.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021083015190823.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/ralunaxomajulinotifu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d72c65a92---goradajekerudizisif.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc1fb4217---waxikigalekemuvi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/62cc6a65b53bd6dce710ee165d587d78/xowug.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/judibobel.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/dipovodasokad.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/jedabupe.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/72650833579.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pavezuvikevetozev.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f25a36696fb---zotuvowanogukiradowiwubo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/icehfd34jhj0578nb8bb9qenev/xakolobiru.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zadosiriba.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/pefuxowusugibosirege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=worm+eating+snailPDF 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_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 10444 bytes
SHA-256: af5bfdbb8864bebb73ec9064642b3dd833dc2109c02a06a44be486ed9e7d1e66
font_01_sfnt_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 16144 bytes
SHA-256: 19508e54198f218bab19298ad5f3d91291d9978b0e18806f3993b88320a476ea
font_02_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1