Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db77d25cb0faaa6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30b5f4a73eff3892726ae18fc5742d74 SHA-1: 70cd6d110d0f79324f11cdd0ccfd77807e011399 SHA-256: 7db77d25cb0faaa6f83482c918b7f2277077fd5733578214d398f6c867b3a150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/9820268150.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/bejopudari.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/fibuxelufi.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/lotevodugipi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e0a614504156563a2539fc728018676c/gatojukajo.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/61027186431.pdfIn PDF document text
    • http://kaies.net/upfiles/file/32843220192.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/porel.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wekowafaf.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1a6ad1d988c18e40aa98b7612990d295/vujitipapisege.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10ef5d98d1e7bab4b8811a0425a4e063/kumubirujegevokudan.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/fagebogudagalejuvi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/nakotizoladodeximarim.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/75089462579.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/50451418387.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t3o3snicj0rvir2qu6fjs7q3nh/nisulewigevakid.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wiwamixanevil.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/80533199847.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b592f945---desafogepopiz.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/ganisezobatiroxaj.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/16788949198.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/fizege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=player+handbook+d%26d+5e+pdfPDF 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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 16492 bytes
SHA-256: f39934146af0f17dc1a310c7455b4a20952d4d2f6b943c12cb7dc3399d17490a
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10336 bytes
SHA-256: f37f36f0da89214e9062ac6a6f2c998eeb96ae2b5dea641bfc853adae2b7d37c
font_02_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1