Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aa6fd0c4381fe0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 09:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46fd5c5c150fa80b5a1df417ccd058e7 SHA-1: 7bb9ceae79d8b11b3f3307e58cdfc0ad5b737b6e SHA-256: e8aa6fd0c4381fe025a76a0a74e8ef8a3f6b3153848b8b995c848b8749076e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bright-mineral.com/uploadfile/file/2021072317585592.pdf In PDF document text
    • http://dvarenda.ru/upload/file/44569900298.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8cdff474462960815cd9fd2c97f4510f/jonetivawusosolisoz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/522d9e8b17c6496e284dd153f2170339/69554702199.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/zenexalipumumuripate.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d26eec4a---44641588689.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/subati.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/3972f6f862b51eb17b0ff0ea1d95ff47/57634227415.pdfIn PDF document text
    • http://splogservice.ru/content/file/sujupugire.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/14211826693.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/10960922889.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/14462413116.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/17481123787.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rjufile5tgm1o693jdrlg1cdtr/bexokorogekavelometonoke.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b69278845---88663914701.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/57578963722.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d476031f---47601959017.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610573f467b9c---sigisuluj.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/67952135762.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/bigesegaganimozubabimoru.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cac91af5---zegira.pdfIn PDF document text
    • http://nfc.soo.jp/file/6443882295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=spasms+can+cause+wheezingPDF 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_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 17600 bytes
SHA-256: 939058d68d75832a55a817fc16981c6e367a29a4dd3ce87ae0d96a0e4bf5428c
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10780 bytes
SHA-256: 440386503cd0cccb723d3d8cffc3ffbd1cb4077192db5ddbaa2a5d121f306bef
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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