Malicious PDF — malware analysis report

Static analysis result for SHA-256 c635d96214843d0c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 10:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0100a894ce0bcf77fb4ba7bbddcabfa9 SHA-1: f026e73bc0ebd453bd64a3e51bdae2e684a35f66 SHA-256: c635d96214843d0c17db41e749f7105dd368e5459d315a05bd822c324568d9a3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute code, likely for redirection or further payload delivery, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cdmsig.com/ckfinder/userfiles/files/weniseku.pdf In PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/6d4101cf9028895a79fea5a5916a8ddb/55942397467.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/57423806936.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b967e31ad---lazugejukoxeputuberub.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/wajegopidimuniriwemipur.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pifedajemubunapowujagoj.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raxoruvukakinaren.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5e07d354b96aa7c528ee09db30923da6/41705449436.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071503c45d75---mobabid.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/7914044201.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db61c301de---81813024149.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/5821042966.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/98461880867.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb2a06689---88666390608.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/kaxita.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/delibanuxiwofetopavivoxat.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210902020046331958il5zz7.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/79115258184.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/57839787865.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611f411a1c51e---82352479153.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wixorujenadusuwi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146ae75949---33763986784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=abb+af+contactor+pdfPDF 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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 17236 bytes
SHA-256: ef5bf7911a36d2dfda8d696cd7b4e7ca065e89072d82e6e59f92c919b5dfc179
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10296 bytes
SHA-256: 7af0f794e2afadb06c5600c004c914ed4819cf0634325ce03f46407603de5996

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