Malicious PDF — malware analysis report

Static analysis result for SHA-256 947fb5cb9a9ffcb0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 04:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0705f48266d9a6876069a290e449101 SHA-1: f5336f87dc14f9070ef1703448c06ec5e7481319 SHA-256: 947fb5cb9a9ffcb032dcd919f5d1ad196bc650d76ba9b9d527c8b850ac431cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://migger.dk/userimages/file/99582170703.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129253e7f69e---fojixubujiwonelasolezebex.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e23ecd2f---18980468258.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vuvawokudunavamemiredi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/820016fc71834518c0f0f89007c2e8ae/54287291197.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/898d25d41f6e3ce1b05adc1e6871a5c2/wevojewo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/58958911743.pdfIn PDF document text
    • http://cwesp.biz/upload/file/91103717122.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/8340515286.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/lagewinefefosuw.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/r9ljs2gi1gqb954ec0j27du93g/kabigo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/5903462825.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf02eaecf9f---kobigaxerupominemexek.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/15348686076.pdfIn PDF document text
    • http://mav-auto.ru/images/file/kowaxafowud.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bikujas.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329aa82d92e---dekirixewoxol.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/7131542707.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/67569602257.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb38d39a6---xikotorivupapugovikabajis.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/36782345119.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/senidakarirabivamup.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/sekakokufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=frigidaire+gallery+microwave+oven+manualPDF 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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10792 bytes
SHA-256: 2f4292a4a35ab2ec184c7085b9de9e5b859ac4c2bcdf0255b827e692e687e95a
font_02_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17544 bytes
SHA-256: c67c7a4a68dac32299e591d0f056a8e85542e6dfe001db93d616e6f6f9dd0cf3