Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cacd456a96174a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 20:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90c6032773a0de25cbf1abaf54a64146 SHA-1: 713ec0c4309cf37adbb2dfefff90dc11862bedda SHA-256: 90cacd456a96174ab47b49f8a680fe24570975f8d36165c14721c1be3f20d579
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://glory-aqua.com/userfiles/file/64187710803.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/48030324569.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee728f2fec9---15245634901.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/xebadifu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/14595730724.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/554de8cccaff8fbda768848217963a07/buwutob.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/83245195455.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b416552a5d---71717474368.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/xuzoxozefa.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/ralumivijetinotipopuxi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/90676639971.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/59222738328.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4fa99b3481efc1c0e5f0bfdc00d5daf/38888620507.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082af872f2d5---javukurasusivexolazi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kt23t79rpkn2h1q8nne2fvs2dt/rikegadatani.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/60999911114.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/43117427816.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1596503971.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/9938bfb0325928e5638013dee4acf5be/tutovegifelaped.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wunemiguveb.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1qhh5lqj8800e5gmh0thh0n9f3/kokovotimenimus.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69726b54d3---96028800403.pdfIn PDF document text
    • https://duvanco.be/docs/files/28875766160.pdfIn PDF document text
    • http://recviem.ru/img/upload/widek.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5d93129863b1cb9eb2dcd5a2fd346745/xorijowad.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/wufasoxuvupirunoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hasselblad+500c+manual+espa%C3%B1olPDF 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 11080 bytes
SHA-256: 19119abf4af6a50aec73d7703663503b8fc69999598160ace0c56338b84adf31
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 19296 bytes
SHA-256: 3733b634f37e7dfb0df07b4ad443335591395c5ef0e249385b230cecc2764595
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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