Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e76e9d9d21a70a1…

MALICIOUS

PDF

78.4 KB Created: 2021-08-02 05:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e43bf92d2dc2ee6c5e0e2c6675ce023 SHA-1: f6b0b8a241f0fb9940d1f27d703975dc273fcd62 SHA-256: 8e76e9d9d21a70a126ea74561721539e33ff5f523d6376e3a9f96522daa610fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple 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 for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/xilifujuja.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e42eee32ac557a8100d4031b0d298d86/nunukuviwefowaror.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3e391358---taxubonedux.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3dc2d7e71b8ed4f198348cbe11ddffa4/71930267901.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3837ddb2201b20811ae07600226b406d/47461715243.pdfIn PDF document text
    • https://maisonforville.be/documents/file/kosufepew.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d3be0421---leguviz.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fc8366ead923f174022d4204b1c66744/85423635350.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ff93f2e688bce7adced18ec64d8ed5f1/55456278742.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9e667ad6---robefoxewaxoreliwojesax.pdfIn PDF document text
    • https://numberonerevolution.it/file/xemedotomolabagoxuxow.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f81eddb6ce7f06b141207540376c4e66/ruzusuziv.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/fikatodexanavopogininit.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6048afb274e2e8a78f61cf5ead7cc145/5069227687.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/86401598069.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/wekak.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061523375010.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0498a537d---46865766041.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/10981112495.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/18c706c7ca269619ede0f887e1e1e50d/fawowotol.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711cfe77834---xaxatufisesujoxinak.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a685c28b34a---7063472373.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/12c70d525a905f039fa5050664c8d9bf/4715200544.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/sigimadiwe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f4ce6076---fisabodudatapod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=intra+abdominal+infection+guidelines+2017+pdf+idsaPDF 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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16376 bytes
SHA-256: d8c5c8586c938bdabf9f6b6a672f8edf256443b64ca5e5f7c695c6c6a9488539
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 11500 bytes
SHA-256: 582e6218b2dc42cd6036cff7064e57d76267cfe747972fc9be0e85904025900a
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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