Malicious PDF — malware analysis report

Static analysis result for SHA-256 3460a440bde34027…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 15:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cf0f0d20c6648209a7a7b3e9088faeb SHA-1: 3a1eea6fa06303c368d8e462fc2a5d0cd3bbc219 SHA-256: 3460a440bde34027982ba0fcc75752388b62e6aa105f664d34ec6f7bcc32861e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c6ec6e6bb8d6fd89cb2a9e2318b6f765/mutojema.pdf In PDF document text
    • http://fxmeat.com/upload/file/a6ba87701dac3c92b46daa877f068823.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607544531b221---reguro.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/aba39713b190506000fc33dd85e8220d/fokuruwoduvesajor.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kusomulijabaxowomefekut.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tafowenabadufasoxus.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/zigiwifekux.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9db3bbea5108340e6671192d08bbe5ed/gevupesavituxefogevurog.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/56209717700.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5bddaec---64757913504.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c70dbc3fb---kibefonuzokad.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/46077758560.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/razapewalinipuxize.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879d08ac15f---xepuwakugojokokisodilewe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34c94a921---51299146492.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/54028829675.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xoribisiwenadajeve.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa9be905b972d02b26b9492e24e77e02/pozovugebujojifanamevojek.pdfIn PDF document text
    • https://anakmeong.com/contents/files/wikup.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/buridejerawilexamivivepeg.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/c503cc03df848dcced1313da4fa5eb0b/55033859961.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/40298643688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=law+of+vibration+book+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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10488 bytes
SHA-256: c0490032ac98f664068bc8aed1a780d518cf07493df9a7c6e155f2ca5d99baf1
font_02_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 17964 bytes
SHA-256: 14435693747b9e193e2d574826b4d6b9e90274180fd5d7428e8408d9a6e11707

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