Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc5bd4f2ea8aa17…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 09:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28f8bf8ec31fe77b52e1d5daba3cff75 SHA-1: fb2d6acdb8a6aef477c15ab8b2d70c028d2aaea3 SHA-256: fbc5bd4f2ea8aa176bd703f976d6180daa6476e17548335bd683ab34459db465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, designed to trick users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=kgf+chapter+1+full+movie+in+tamil+download
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/wamisurilitixubimes.pdf
    • http://askaudit.ru/price/nixolanikubonabo.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ao3det3sgof8qmk3no6eojo39e/81351071601.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ade5df0a8d2---64925625071.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6mathoc1fd2inf1lu418140b6d/mewutig.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128f51025ac4---31271555138.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s0cqbjhvmg7ndfk5bu9fiop010/fegozexukanofisubos.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/zerogalam.pdf
    • http://evohome.pl/userfiles/file/5163506601.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f27fe6cf7f2fb9e4cc410d6e3201e69a/bokujudebobo.pdf
    • http://szao-spb.ru/images/news/file/wuxezoromilutapobu.pdf
    • https://codecs.roimages/file/suzuvujewijifagatonun.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b4efdc95f---ruxudovutuzax.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256dd80b35---kadonajopepa.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/71431095385.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/fb34d7ce536d220134f4ef9ba3faca68/duxabomavevagofisovuxoku.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860eff73f69---32347854161.pdf
    • http://www.jindatunnel.com/up_files/file/difekude.pdf
    • http://kemmurad.com/webroot/img/files/sinelonetofo.pdf
    • http://www.heksan.com.pl/file/zelenisitazakanubolaju.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/92129198126.pdf
    • http://harc-ias.vn/Images_upload/files/vomes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58f.bin
ecf78a8ff4100b3227f2cd8bec40957ec476bc9931b99a610390935783f6e18f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 17756 bytes
font_01_sfnt_off0001139a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 16792 bytes
font_02_sfnt_off00012bb1.bin
100b30741992fa06eb18ee8e10256ed2ba784b37692cdb5b1e3d7d989421a7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB1 11196 bytes