Malicious PDF — malware analysis report

Static analysis result for SHA-256 0246ff12c27691c3…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 04:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5fb1a4c67bbe513eadfdba6084e5f7a SHA-1: 4d5aeb79df83159f70e52e8ad88c2b3984079985 SHA-256: 0246ff12c27691c3014a52564870199374a0c441d21d4fe0eb2f14514c901d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://charivne.info/images/file/19052704406.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/89906761566.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xadolirarowivetezaz.pdfIn PDF document text
    • https://mojer.bg/files/46197223890.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/25775501719.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12793117187.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/83318c9491c597b0892c7c1707f79693/vepisaso.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/bineravenirap.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1e5dd0536530c21aa7a7cc23b1afe10d/pukevawaxu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c97954befbc---15112747394.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/wirokarifiziwuxejofiledug.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/85010853652.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f9448744---dosifabazidesu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/bimexuperujudepelirufago.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e6bb339510e3fb1fbe8f5a684d19ec4c/zuwesafajamitagifemi.pdfIn PDF document text
    • https://congchung7.com/upload/file/lidurevivawozegutagajo.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/31899467555.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/66a9485d2c67fb7b55969afad5fb6489/leviwivutoleteta.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/soxameli.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210627131455.pdfIn PDF document text
    • http://caythuocnam.org/images/files/83823459391.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/12326815889.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/60973989072.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3257ac936f22f2165efccbd648458d94/jibutenenawiletodutudo.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jonisabejujobelebeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=words+with+the+sound+gPDF 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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10496 bytes
SHA-256: a7fe6e2ca3044619b02ec08dbe57b01c5c7d81177b0e95cb75ce92d1f3070a1a
font_01_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 20576 bytes
SHA-256: 46c514878bf8fb824edad2d64ab3219b0f1475ad68117a879566e3d931a1a7bd

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