Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c75b398f018560…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 02:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 132a38ab0bae7e3a15ed5e849dbea70c SHA-1: 8f9f891ed29bd91e583468444af588c7ec318d3d SHA-256: 83c75b398f01856054c550bc102e562d99ab2ab455128fb2cff4f7d0f3063ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tq38eljlluh51vcbbjbb61vdt0/82831505084.pdf In PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/88410372923.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xoxevowigin.pdfIn PDF document text
    • https://alutat.com/data/file/juzazemavugedonubatenuv.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/orfoulbvfj829uk7q0vntuk5md/boluf.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zenovijavejozigu.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/93685153324.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/likenufevipedifafoxugigo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/97120784611.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/barijufafizatuxosemaja.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/kd6vmg1e9a27bnq1l4ano8ulg7/gugezakatibegepebun.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gubizokuwibedaj.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/94571761115.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/4614334457.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae293b15c2a---52612715900.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e04d64fe---julabijofazefalofopurinut.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b500aed2---4427892137.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3297ba3b00---nanusumeka.pdfIn PDF document text
    • http://fxmeat.com/upload/file/aa728791c6c1e42e28d498247ddc2f64.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6efe91cba3f3903acb90d537ba307822/zupemufafibapugasar.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78fe6144a---tutilazop.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39cc5dad8---88254013173.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/xudilujesubivilukupi.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/92167616476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+figurative+artist%27s+handbook+pdf+free+downloadPDF 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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 11256 bytes
SHA-256: 40be6e50778fadc4bd6f8ac9769b1d6572430efa26521f1a0a0f4dcf6881c275
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 19452 bytes
SHA-256: ad37dc28f41ad0540a6543baaa0b7f8dbe21169624b4c71604829cef3360d038
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1