Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac5c92c4856de99…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 02:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c79ca240421f839189d202a4657d5dd7 SHA-1: 2d62e9a3d6d0e7f7416570713674bea41a6db1b6 SHA-256: eac5c92c4856de99f5277b39ec22b4b100033ef7616ac4d43908fc96f5c296ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pistant.ru/uplcv?utm_term=compare+redmi+9+and+redmi+note+9+pro PDF link annotation
    • https://moraure.net/js/ckfinder/userfiles/files/sutaloxurisajenivelin.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r8a3o1kr3fvg82kq1h2h1rdgl8/1793377891.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/gamekobof.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/54289984922.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/28905404710.pdfIn PDF document text
    • http://premo.at/userfiles/file/10785907773.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/36628319943.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/naludugenumazurakizune.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/95505267556.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b8746ce6924a9d73d0d53a42e91a5b1d/mapovaf.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/61724069067.pdfIn PDF document text
    • http://ymmicro.com/files/files/dorugo.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/keduwujupuvafigi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b32d17993---61255731860.pdfIn PDF document text
    • http://15881588.com/ckupload/files/48602475458.pdfIn PDF document text
    • https://tavio.ru/files/file/73749283068.pdfIn PDF document text
    • http://scsytech.com/upload/files/64689767382.pdfIn PDF document text
    • http://jsdarvin.com/files/30747760593.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kexelalewidapukazib.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/26264016303.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b51680be4233d02d1a82e654ab97cbd/pepurapudujabamukorun.pdfIn PDF document text
    • https://online-wums.com/files/files/62942505227.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29422753560554603a68d3d0ca05e1ad/62668779767.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/91675069425.pdfIn PDF document text
    • https://tomas-music.com/contents/files/dofovuzixutozid.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/97322937807.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://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_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 10540 bytes
SHA-256: 4b13bcefdd4323b89f7fa3647d10952a85d7a7c8b08523fd5395e526e280424c
font_02_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 18484 bytes
SHA-256: 6027eead45f8204c2b96aaf47fe89dcad5c4a262421857c95f05318baa42275e

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