Malicious PDF — malware analysis report

Static analysis result for SHA-256 aace2d9bc1d8ef63…

MALICIOUS

PDF

79.8 KB Created: 2021-08-29 10:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1af6f8ba1ee114ab6005b0bd941a820 SHA-1: 4307726723fd056ac103598a996dace06b420165 SHA-256: aace2d9bc1d8ef635c047a60cacd5fdeb201918c309569fb5ec953d750038880
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9ea04e41---jogakox.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8baba0e329872111d72e3ae03c6fcb2c/26286371873.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949de853040---32226148508.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718370ce259---70800230511.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/93530260741.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf13333ce---5377107708.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b795dc13632---xujuseb.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0037f41e3---14351867985.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/57334466234.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/diweniwinel.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bavexafapupikopunawokuf.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/noxowalofoz.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xowijufisazopo.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/juvunapewusolubanewojekiv.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e93592a91c1---nebif.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lotez.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/xasanulirig.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/subelaxoruwobabumivibuw.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/45607722517.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/10322673471.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/37860708193.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/narolegoxadutumexezitel.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bec84dc96665a86de38814e6dc26cb2d/vapevipizetifesudoniwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=30+day+butt+challenge+resultsPDF 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 17304 bytes
SHA-256: 9063415c5480b46846c386e67b6fdcbb5442fd1df422ccf8f149f8d8620e4d24
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10988 bytes
SHA-256: 94942d82ea6e5aba15f48c2a357348540d6a79de366aa326cc46bacfef9ae706
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1