Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78f8ccce46aeab8…

MALICIOUS

PDF

81.5 KB Created: 2021-08-12 06:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: dbac82f38da8252c4b62c6b398341fd5 SHA-1: 046b11db5cb2e80485b8e99adf39263040982df4 SHA-256: b78f8ccce46aeab8aaf3f13581f8f0647aa44c69c36ed8b875ec5402994984e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=eva+foam+stormtrooper+helmet+template PDF link annotation
    • http://libron.pl/fckupload/assets/file/nuzofajelujit.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50ecc4fcc---20391926452.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/fevabipivurivab.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/28649190460.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a266d0f9781cfbc7419d8a7aa6e81793/waxefozadevegakujataro.pdfIn PDF document text
    • https://aksusu.com/upload/files/kalebapifibuta.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d8b10e70---39645081642.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5o401bhvhcvtpufgh175qs061/gadamuxoxugepola.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faboxoxu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7892f6e8ed80e308c19bd3e9169377af/fenebozomogaxajewuge.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9d435016---34190238140.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d7a2813bcdbbe353024cab8990609375/zavifa.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/wewolemote.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/jegejirosofawinewi.pdfIn PDF document text
    • https://ubranni.com/uploader/files/momexojexusetijiwixutura.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/bogamuru.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2e5f3e8cf85dc6de8b87e9e428bc697a/74298866107.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/48434650399.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/rapabagigavifavatedis.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2fa5b7f71---32139863836.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/72310333759.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/66639316931.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://goo.gl/MAqWWVIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10476 bytes
SHA-256: 676559c8d3a3c268d3eccba5a2ee304746d0546af95cfbc5c034802c3aa3b618
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 2972 bytes
SHA-256: c58362a352c61b2f17a09cf87d326bac257984c96df765ff968d419ca8a8a4a6
font_03_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 16504 bytes
SHA-256: b86291e9617cf11c85ac7efd187ed5e22df59690a8c4b529058c637979ee4153

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