Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5814d8d6dfcd60…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 412763086711abe8d02dce53e85a5f5a SHA-1: 27ef5fdea96afbd9fb20dd3256610fd2e6a9ced8 SHA-256: 8d5814d8d6dfcd6073052a82595790eae17874309920edb40bc5308e5d6f1595
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. These links likely serve as a link farm to redirect users to download further malicious payloads, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=nord+stage+3+88+manual PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfc0cab43---ropiwuzugukorigabojofele.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780246d17b4---tubixawipotatewinit.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/99606084664.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/xizibugona.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/9562e3d1fd0486f3ad7e91bc06ba781a/kinowobakazebidu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/84874206243.pdfIn PDF document text
    • http://strandedtattoo.info/file/vajilatozu.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/zemiravelusufenabonekomu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/pezagari.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/14548616990.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9va00i7doh59gahac9nmojcoe/togesifagodevowa.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/8388834851.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66290e875---bikubagativiluwozu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f88e4dbcd4a---25528661836.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/namaponurifuregasal.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef4d56870---wuxubivoxafakegovuz.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/93445448133.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/detumaxomixa.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210813150130.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a122671d07ebcebedfed5e08fbd0f157/falezolida.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/mupeki.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053e590ac3b---86058224141.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/pinugudifuwomak.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/9715879006.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/wutuj.pdfIn PDF document text
    • 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_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 17944 bytes
SHA-256: aa92c2f46030c0e89f656077167529f1ffe368ade3f3685aba512a211670bc3a
font_01_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 10956 bytes
SHA-256: 378f917f0c3e0d03f89f40ffa06990c5f26ddd1250ea4620b58f9f3ef2e1f91b

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