Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ce98d64902bd4a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7e25f3f985a8e6de021cd0f5ad68aab SHA-1: 11debcdc5ec3e50f3a56dc99a50cdca480ec00f5 SHA-256: 20ce98d64902bd4a2a8fdb93d974fad50779acb36d6657d01789da5678ee79ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=apk+minecraft+for+android PDF link annotation
    • http://talcmanagement.com/uploaded_files/userfiles/files/valulozirigiku.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/gigomejaxezokula.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/72265890037.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/84585135401.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614248f56d5ab---23580329775.pdfIn PDF document text
    • https://qkon.ca/images/file/rakaz.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/ridunegozapa.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadupovak.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/vobamesezuzupedebevuzipu.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/womef.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/19120849940.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd50e16d3---87325726802.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/zoxikumegelaluj.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/12588165004.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mafoperevetokumumi.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/merib.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/6713596782.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78f4e870b502865553d94f9906ce2543/59537705329.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/14487668871.pdfIn PDF document text
    • https://cet.sk/res/file/gagizerajisizezoxoba.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/tegigafuwun.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/jesevogeviw.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336b78cf252---pukatuzuve.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1a43dee47e567b6c969b621b8ae51a06/75745757649.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/fexulisobe.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/mekaribovafelorozileka.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_off0000c483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10640 bytes
SHA-256: 8bb99912216c0e8708931ea8dca17ef054093e4885657278e8c87a1b2091146f
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16548 bytes
SHA-256: 150661fa3b932128ccd83688b1a77a0a019ae0fb87903163a50f8fe31692e06d

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