Malicious PDF — malware analysis report

Static analysis result for SHA-256 213a51360682b12c…

MALICIOUS

PDF

98.5 KB Created: 2021-06-28 07:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cedbc5470ae60b52e6d802e0672586f9 SHA-1: a949f7a42639994c72a0d7e171f8fd75d9915d29 SHA-256: 213a51360682b12c682d46e5844b5a7f2b613383595b9729df755b654b92e9dd
196 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 payload. The document contains a link farm pointing to multiple compromised websites, likely intended to host a password-protected archive as suggested by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick the user into downloading a secondary malicious file, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cautrucpalang.vn/webroot/img/files/benur.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e53f0a49---44575650445.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ina7d7lspecbpodpe9lk4ko3t1/27457653530.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160943aae74bae---75446814322.pdfIn PDF document text
    • https://oversaslogistica.it/file/koxugazumipijaroluwep.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a1319da148c---lukozisijatajekapefug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db377b8ed1---29290011095.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af336e95665---40723009523.pdfIn PDF document text
    • http://armanetti.com/images/82830285961.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a5ad08fdf22be24e9594be46f14eb7cf/fodexi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/24tm4k57u81s3v21r1aa5bjurg/52626961508.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/feribasarutafu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b24631eb6---73853630358.pdfIn PDF document text
    • http://imaginove.eu/data/Files/53517869898.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/6446878205.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f1f6276e782a9d423dc60a045c9fd2d0/novetogowegixixowide.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e60fb32---nekufibovufigokejebaz.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/972352936781ee4a062dac17897b440f/4574399624.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc501099c4d---74000789855.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/lujurosa.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/129a01c820441c7cde81cc46fd756c85/mupefeneme.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4950caba83---zekulasobewazi.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/lirivekodiviv.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/79664647621.pdfIn PDF document text
    • https://computerzone.pk/file/xajunurasamijevomilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=diff+between+tdd+and+bddPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 17788 bytes
SHA-256: 4674243a60bac4b66f2f1d6c795bc089c11efcd00e4a2381a51c232ce7979633
font_01_sfnt_off00014dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 10140 bytes
SHA-256: cf2e0a9927080bc201aa9677a9f9d04260c6439170f17b04395c250acf569ca0
font_02_sfnt_off000164db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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