Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0b02480c00c2ad…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 11:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8ce66bf334727b9e98350b248a7c037 SHA-1: 1ca48f00e9692adc607ffdbea7e7b330c0ead490 SHA-256: cc0b02480c00c2ad5353c73a461684e3bf23df029e0987a9fd05c42403985d03
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a potentially spearphished attachment to a document that then directs them to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=fraction+story+sums+for+class+3 PDF link annotation
    • http://neo-net.info/giganet/files/file/77187076844.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/guboramovukemurozokaze.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/82913332373.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a5aebac---mexefixifu.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/jeboros.pdfIn PDF document text
    • https://bunianco.com/other_files/File/89617006650.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/12592231195.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7li12afm7lco8kosg28mraq871/makim.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dukapoxasijurax.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xoberesexogirimusafote.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/mamuresoxozubuzamawusem.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1f0e7c7d5842ed41aa3a6f685af6a57e/bagelozimalitelokewavuxa.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xokujuzanilivetawuteteji.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/ferarud.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad7e039d3---40953702448.pdfIn PDF document text
    • http://www.moyekolodin.com/files/solofuwadaxetogi.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210929172822.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/93340576137.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/58383374173.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/16221988422.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/40894024702.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kadun.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/92722908062.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_off0000ade1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 15888 bytes
SHA-256: 419b7c3c82f38bf1260173f8e739e6bf4a25a3fcbbe41acf59e0e6263d0520b7
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10728 bytes
SHA-256: 3e50012a7a3e8fa2ab68e1f41f9cd32271053dc3fde1b6ecd0262ff1363c35e5

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