Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afa4f379388efed…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 01:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79d6ce5108419c5e21960e857a754802 SHA-1: 33c5921caf42669e95a8929596fd25538c5d1033 SHA-256: 2afa4f379388efeddf7917491c7d675de4694e14c5791d145fc96337bbd5b6db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. This suggests the primary goal is to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://filippodelvita.com/demo/userfiles/file/vemamuwomuzatenemole.pdf In PDF document text
    • https://tspinstruments.com/cache/fck_files/file/puxure.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/75695846751.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7bd33bfb---65902085894.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700cf64d4de---pikidupavapinojuzeba.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/4571560320.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/revapupafikoposevewuwiwo.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/jegareguvusemuvam.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c7732fb---rifuwanumana.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f3010d7a---20129970835.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608248d762b6f---lokibuxap.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32db87b26e---84967491065.pdfIn PDF document text
    • https://rosycaffe.com/file/pisuxegamewiwulodutifofad.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vuzolafiwisigidux.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108200905202843.pdfIn PDF document text
    • https://eurotig.ro/file/33629587953.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/27175819282.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/17780643784.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zemegevitivowusedarovom.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/765q6l4d3mu2bhj0ot36ifhv0e/64016734120.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8035188dd---jumiromiraza.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/26306637638.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd20e2ff73f9ac669bf5f970d3692f2a/91653701498.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210731_3C8A276B7B60CCFA.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160705da13316f---18271902940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=shark+ion+duoclean+cordless+manualPDF 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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10804 bytes
SHA-256: 5b787c87c550f72b1a55dfe2d8311f3e0af9dd1b286bca985deb8f1b30bf405b
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 19416 bytes
SHA-256: 94b0a2b20cb6a03f8b5fbff8b264cbf90809722b173bd8601b2081f86e697766

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