Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b04a31e3103fe39…

MALICIOUS

PDF

82.3 KB Created: 2021-08-15 10:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d44403e02ca938afd00c08c7d2cd5f36 SHA-1: 5a2d2182fc7d22c6368943630afa6d98bb141f6b SHA-256: 8b04a31e3103fe39f9d88ec5c6b296bd1034e93d115d807aef205e8b83a994c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a network of links for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=what+is+azure+certification+cost PDF link annotation
    • http://rauvuonsach.com/images/uploads/files/8505695952.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wavutadovobexamagifow.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/fatapegokezubojonud.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/pegakajepopidarilabemufub.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vobixam.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/jobiwuwuwuwigejuzorik.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/10116470640.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sabolobupiwonumuwetawi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c3d421ff2fcbf03a186327c412b116cf/31243535667.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa//files/rafedatiduga.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161074a4f7e58c---filonixusenewudogavonop.pdfIn PDF document text
    • https://susta.vn/userfiles/file/779445877.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af46baf18---xipajevupovor.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce27ce7a974---gakabefapomomum.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098838e11f53---70808899362.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b555e7bae8202a7493c7d6e8281bd236/87353548845.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6066046b---lowonidezimanibumijebe.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/39177260762.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/mapogituzevinijumitu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/bazawewomurukejid.pdfIn PDF document text
    • http://kaies.net/upfiles/2107251348388016597geiza.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/67640206154.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 10540 bytes
SHA-256: b08dc384425cad01e0df880a474fecc3cf9c23c37dbc0532214f0fb4d607e1d0
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 17252 bytes
SHA-256: 6de1682fc6dfdfec1b546f6f83dfda655aeaf888ac8c67f8cd192338f176ddf9

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