Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4d01e60da907d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 05:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bc5b62af315d52fe4b87c833f557a89 SHA-1: 6cf2cd9415a9b9d5021c68cde15a8669fa21feb2 SHA-256: ace4d01e60da907d608715d5f3219e683413afa3c7b69fc9e358156c2503e333
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URLs confirm a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goodmax.ru/i/files/sexifirawuwamufinugake.pdf In PDF document text
    • http://oodow.cn/upload/file/210910190127973679z9roa42v7mdt.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/40686621722.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/38460228206.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/melizuvujiveje.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/88813925298.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/pazenekizija.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144204ba69d0---28523552615.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/jogiwevanamebaterekugi.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/48900238089.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/uk90l20fueholip5tsf74cl2qt/4957050289.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55b90e136---5567954667.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/27865803798.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/2570479034.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/91947311244.pdfIn PDF document text
    • http://protok.pro/upload/files/sifufifazodijigelukenekes.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/55d5e1.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/wamojetosixefidutixexawit.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/79408024706.pdfIn PDF document text
    • https://aaaxxion.info/images/file/suzezosisagebivupu.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/debelupenolupo.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/2193320189.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/90518584053.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/musovabulaguseso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=open+setting+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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 19916 bytes
SHA-256: 78761e251d139acf62d80fbd2c5bf32338d0722ba791a7079919d116710f53d5
font_01_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 10280 bytes
SHA-256: 395e8b063ce7bca9b4edbdb381061af815ddbea4710828fd3dc9c0535199b75d