Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58b7a66ec3d2f18…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 23:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31776a8e25106454cf9de49c3febc6a9 SHA-1: 5277bb578bed876962f4cb63322fd1ecf0300323 SHA-256: d58b7a66ec3d2f18e77bd4e2e3b5f60d1fbd5e1d4f0f14365e858992ec675349
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via a link farm. No specific family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e02e9b7fc---66396697138.pdf In PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/jewifo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/878b1b458efed86e71ee655b8e9827a7/sewobukakugenabake.pdfIn PDF document text
    • https://adikketiga.com/contents//files/75529837666.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nowot.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xiparutinom.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070411173851.pdfIn PDF document text
    • http://vlajamo.cz/images/file/75929431278.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210525032036607221134.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2ac6397e---6957782025.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/848e73d2e8b32b6c66f92ea1012c4f72/devaburiputaw.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/ligub.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d5i869nppa7v472fl7sco5o1c1/jimuvexos.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/18062981729.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/47807309965.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/81571128628.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f0084572---narunomawiputexaxap.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pawaz.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/88334728165.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c08322c37---gusajiwu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/222m3jbksj1froo6t1v9hakqi4/gitofapolalolad.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fomuzutojisaxovamusisaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+libro+de+mecanografia+pdfPDF link annotation
    • 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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 16428 bytes
SHA-256: ef878a999680ed35c92724f5d3f5b179aa8c3f1c9bb24578f49c580d84720a69
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 11008 bytes
SHA-256: 9cc107221411ced219af44d5870f4934033fa3ebc9544f4981c021eaa0e11322

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