Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd491dadafb1447a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 05:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 721635adc4faef60da6f973decccc409 SHA-1: a737654a5ad3b60b79d30c15bb05ff94dd03d69c SHA-256: dd491dadafb1447a14d9b612f85b4d1bad828857114365ba1992a04af852e667
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, including links to compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=how+to+look+at+someone%27s+instagram+if+it%27s+private PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbdcc4d1f---sitowuregumupude.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161483d1233ba3---36513890507.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/kodev.pdfIn PDF document text
    • http://domexpo.ru/up/file/kagesadozegokudesisitil.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/gogudake.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/58554444808.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/1872515799.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/magabebuninal.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/7624822168.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501ce826286---zovomaga.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/18035267678.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/85910460425.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/41081221288.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/1295613900.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/11996526031.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/82733133303.pdfIn PDF document text
    • https://trystsalonri.com/images/file/23382980479.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/9896257106.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/golikekogotizin.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/1182049520.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/maniwozixupegegugo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rorare.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xigawuzaxopasusedelegu.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/pupune.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/68518337873.pdfIn PDF document text
    • http://forum-auto.ru/data/files/42478613431.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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 15044 bytes
SHA-256: eea099c7e80fe719bfb32ed26960ff2ec86ba06072a4e8669083bef39ebf243c
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10972 bytes
SHA-256: ac24e52c4707e00646e6a737b9f73e869b42fd6fdf3ede4b6f5be700077794e9
font_02_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1