Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08b2896fe1032d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 17:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e21bbba8ab8fc607ae68ccb9320e1d5 SHA-1: 9706b9856bcefd4af1f1be7a24556c6f65abdb73 SHA-256: 8a08b2896fe1032d16e9c106fa1290729a8e629346d50fa7789d5cbffbcf222b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=exercicios+classe+gramatical+9+ano+pdf PDF link annotation
    • http://arcomproltd.com/userfiles/file/difadodavi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bff48fa8---71627945686.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wiroj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66168465d---81109519865.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52003a3566---wisadis.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/wojeteziboz.pdfIn PDF document text
    • http://hncastlecable.com/d/files/39300084511.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/727334724.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/deselivazinevidujodaxo.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/4908806582.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9b8815cc4cbc7cfc5f431e31aae40e7e/31932601862.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/30107256256.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/28164309369.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bewew.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/lerezavew.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/7155476085.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/229f078c2c77be8203b25a4d46645897/fubavaxuzad.pdfIn PDF document text
    • http://waypl.pl/upload/File/fojuw.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210830184904.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b28738890b2---mavelibemeli.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nukab.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a53149c616---runumusibaveze.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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 20436 bytes
SHA-256: bd5da1f4210396d290d531fa16b4ca5ad0fa9b762aa925c365b1beaae5839f29
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 11216 bytes
SHA-256: 6d874acdad71d73a63b52be8868a38c9cc9688f60b7c596e07e2600aa219efec

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