Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf7d773b8f10eb1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1ee3960daaf825cb605572fb25d902a SHA-1: db196d08f9e5f54a1aa4f812d182c9dc368e7333 SHA-256: ecf7d773b8f10eb1bc9a087ac96e782f3d14a5a391d150724393b19f05388818
164 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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://haai.org/upload/file/58828250597.pdf In PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/fekugobog.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1cf45a5cbf4e04e6fd3ed3adc7321170/kepovu.pdfIn PDF document text
    • http://df-foundry.net/d/files/83312497618.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/44864015890.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f76812b06---18567685963.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vedipo.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/49055735231.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fitemosijus.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/bebibin.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/jojubogusivebuf.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613362c2b3a10---48546090219.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///vafuwazukewupikovagu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0af8e5da9---51150459613.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/kojepotomimije.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/84823482430.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/wowinavegov.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/30648237599.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/54590131933.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/673696f9b7405d835223135a0950d620/3608301487.pdfIn PDF document text
    • http://linker-apps.com/files/20764157344.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/21269840496.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/65605921652.pdfIn PDF document text
    • http://zl369.net/userfiles/file/10352288970.pdfIn PDF document text
    • http://clingac.com/d/files/10640721705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+improve+internet+speed+on+androidPDF 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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 10652 bytes
SHA-256: 345653d12cdad40896ad7e4ac024b6ef2934a451b804fed173b239370f2a1dd4
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 17076 bytes
SHA-256: 3c622eef8f644d7c1f635c1bc1b67f0201336edfc3c5f557f73ad3dab289006b
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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