Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede3b2a0e7cb8b80…

MALICIOUS

PDF

79.4 KB Created: 2021-08-16 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f131843286efdea1af09b65c944da9ac SHA-1: 977bc98eb54c02d1e3b999c78fe501238f1768d3 SHA-256: ede3b2a0e7cb8b80ec6dfa3e407b653137edfe8ef59991096140ecaf88c73040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains embedded JavaScript and numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nomylo.ru/uplcv?utm_term=una+estrella+en+el+ej%C3%A9rcito+pelicula+completa+gratis PDF link annotation
    • http://brkvinc.com/userfiles/file/tanade.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d4d2419b36152bd72acb9b9b2c9cd332/92840778600.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c1c082b65b7aea8a160d65782b6e1069/29501397205.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/rutizixokojitosokuj.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/93464671600.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i3ipo6l66n8iv5nq2n5d08tg8e/nalozapijipulug.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5dkugi4pvemg52co02enibbe8r/50667689308.pdfIn PDF document text
    • http://e-hematologica.com/users//file/90022032360.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/95907350491.pdfIn PDF document text
    • http://lyshiying.com/d/files/77332948438.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/xatagezip.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/wifez.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/070452255184.pdfIn PDF document text
    • https://congchung7.com/upload/file/repilupetagamajon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2149c61256---52865748382.pdfIn PDF document text
    • http://saydersan.com/firma/files/93726820941.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/1912247721.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/janox.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add48a559ee---84826114491.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210704_8237595A8AD8973A.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/72350498768.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/9466763312.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nusatukusutaz.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_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16956 bytes
SHA-256: 4a6750c1c4ee382d44bc25dfec22df8ba88c90a08ec81a601c55747d6fa911a5
font_02_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 11108 bytes
SHA-256: 5cbc527ccc4fdc7f55446a8e372cdb32e18d192220a59c85ff6dc170132c6885

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