Malicious PDF — malware analysis report

Static analysis result for SHA-256 0976ec322a2cc02e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 14:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa7f8d836c568563d5abe21d3ab7c7b0 SHA-1: 9d435c84a26ef82235a44516faf02d08eababdec SHA-256: 0976ec322a2cc02e0d5b8253e5f6a9058bcdb473cd8c4eb32e26d0f6318bd30f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e73733---ruxebabigasijo.pdf In PDF document text
    • https://bvphcn.bdata.vn/upload/files/81356084600.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/4431935412.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/fividub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa2c519b39---xomizig.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/nobopowesosa.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/32603444974.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210925050057.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/rolorewusubibubife.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zejover.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/53250775831.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zozeji.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/8442871904.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/5001102940.pdfIn PDF document text
    • http://slsnn.ru/content/file/gometad.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109090932222438763dp74zky0pt0.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021929191021525.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109281316084759.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/80284670519.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1b6c79c26---81696219794.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/7185658556.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/nogagujekanir.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/70706871676.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dja0u821527iit9sogfjq6mc6j/temimo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6ouhoakhid40bbq3m2v030m5j6/fodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=instagram+web+viewer+followersPDF 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_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 10800 bytes
SHA-256: e1c315a4f78c002edae8b3ed210fd649f257ec0740309fb941b647ad853e80a3
font_01_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 16656 bytes
SHA-256: e3979090b39afd094b468be70c9cfc2858effb914a67417031ab60ed07026dd9
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1