Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d5449e5f3e3e68…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 06:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d237ca9723fb74083ce9e6fc61707d00 SHA-1: 93821c5439327bd033b65db583c79f79d5c4ad0e SHA-256: 33d5449e5f3e3e688cf489ccc505f00f215bde27e5b1c2ac6faf382c01f9635c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://wdnederland.nl/file/756276829.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/07990dd2c293e586148e56ff8b1836c8/25208975340.pdfIn PDF document text
    • http://weingut-suppan.at/files/64905955900.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e969f44---mepafufujadalumazokukito.pdfIn PDF document text
    • http://contua.org/userfiles/file/1413693678.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/tanujosirividawepazuvepiw.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/48745398645.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/69141137400.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/vesuxovifuzel.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/4729497066.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kibusuvasovaf.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/jexulogosaxit.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/9052949711.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/nobosudokodo.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/zoxuzozinilazobatiw.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/83761291216.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16146bb53f31d1---67086162535.pdfIn PDF document text
    • https://mytopics.it/uploads/file/63479205360.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/35469862661.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cef3d61e84---mefupakofabix.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/90364997365.pdfIn PDF document text
    • http://cecev.com/stockages/files/19399186826.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/91651264217.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/jafuvubovatox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=quran+tajweed+apkPDF 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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 16228 bytes
SHA-256: 2a1280ae42addda5daf28efc5f340b52459d73bac21e7e51c8757e665b3992af
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 10428 bytes
SHA-256: 8a23478951aab4d5238a71380454060c243ac402b6cb50f3c88ccbfb43704b7a
font_02_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1