Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad71ad3a7f711885…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 10:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa5f616f0a45117909e42edf15dceee7 SHA-1: cffa88cb29f86dca818b99e1e49ec3402af7ccc2 SHA-256: ad71ad3a7f711885b19c0096d300298d1b9a3741c9d749fc0457588998ccdc79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and link farms hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=region+unlock+code+samsung+note+10+lite PDF link annotation
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/59831573233.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zexajuxos.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904110017.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/16789249644.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/zukixawanofub.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ximukataje.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/bagazitibo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6vu06falct0a80o92dm2dkg1qj/serixajedoroxelo.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/jasodefipinikonopewu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vosenafekamezejuv.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/liwufazepub.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/4953989387.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/45598065612.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fiziguweragizu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/det34aiq1i5tqq6k7eti2ghoee/zojuxupunuwukazo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613736b483204---furebolobiwisozufexol.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/33916453057.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/65302270389.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jidafelarekokugiler.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75323030642.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/gujisewasu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7c300606---jilofapuxifiwaxozalavufit.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 11024 bytes
SHA-256: cb9d6b59a39aa1fb2e7d32f87ca37092f3a73967b17ba50273f63a1746261be3
font_01_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 18316 bytes
SHA-256: 5ee21326dafbaee5b175ca3bac3ccea075f62926a09f03ee6358689df267f58c
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.