Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ace7480560481f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 01:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3fc64b8872b45f6d602580ddd0a2742 SHA-1: 752f193743f4bc81c16334332a5d62225fb6698c SHA-256: f4ace7480560481f26e2d316ed682f45a8820080ffa2e9c4d2f0685cc29897ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.anieliasfx.com/uploads/textareas/file/22435176212.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8d6c3e95---zomamorigofixo.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/59223066156.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/45600506566.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/29197145275.pdfIn PDF document text
    • https://arendic.cl/files/kubobanofazap.pdfIn PDF document text
    • https://norservis.info/files/files/jiwuwivitomewomeregodewi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/53457502916.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/zuwenetegizab.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d11aded97005d328a58c0dc7a4453a8e/27927703651.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jeziju.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/51688190388.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f011dd24efe5573b5712a0928b0046fe/95769568630.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eec9d1933---3921753541.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/bebune.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923a4e4941---tekixagukomapivisomures.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6a8f261d78a6b45eb229fb863f0c06b6/verogotamumekekifoma.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462f931c7e---bivegokus.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210729/file/86683011319.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/kenapadevafizagusopirod.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce86f7b8d7---zomavex.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819cb65c562---18883783850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=goldfish+breeding+guide+pdfPDF 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_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 10796 bytes
SHA-256: 30537ba5943b00df721ba0904b8d6919cf93b1d7fb934e3aec92ea1f47d8afa0
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 17784 bytes
SHA-256: c2cf6e4f3e800f21e6113cf1f75765159d6ae08d42e947bf5c14abc195cf9c4d

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