Malicious PDF — malware analysis report

Static analysis result for SHA-256 823e1072c2f73a84…

MALICIOUS

PDF

86.4 KB Created: 2021-07-09 09:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01b50cc3a1565b408b491aa36111e363 SHA-1: 8d3392842defd70fa1e0417d732873755f97d228 SHA-256: 823e1072c2f73a844ccde86b6f5793f164f83cc4956e1243dbb3cc1e109f7d4f
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=five+nights+at+freddy%27s+ios+download+free
    • http://aarogyamedico.com/userfiles/file/54393531281.pdf
    • https://arte-salon.ru/upload_picture/9473265500.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/7034182130.pdf
    • https://m-isc.com/userfiles/file/refirodafabekejeral.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/f545kihc3v3cq4603566si5ntv/gigorupomeluwekaz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984d0dbaf1a---wawugutowinodugubex.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917cca87ce6---renelijiro.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nuwedifimetazuzigar.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d89d31f344d68f07d417107b64237c2e/dafime.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c2f400100a60743252f51b8c71529a8f/jigokikifipixubinomudi.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a6a4a4fcaf08e70589909726af8061ad/80493618962.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b6cd21d1---48232890439.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2397000d8---sorekavejakijin.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee1333227---pakepubibakufawi.pdf
    • http://abovomedia.hu/_user/file/40914889205.pdf
    • http://dorp.pl/userfiles/files/dafudeviju.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/47f0e0c60b0d68c381ac86c8d7e431a0/totubebupepoperivufulusul.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dd183ed6fcc7a2fa5ac9aecf36e926a7/23188227658.pdf
    • http://tfforming.ru/d/files/pejosudumoxuzefa.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8f3aafa744b1f4c39006df4cb511c817/41829118888.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/18vgpqt4b49bbhpldc7iojk8m6/58474910478.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7928dc6fc64b652c0ab0019291772059/25214518125.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2b6982be---jasonokinubevoguluwujan.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/zujibexexekum.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/rezusubok.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/01d708c7db3b2300e6f8e22cec062cd3/gumanutipuzikakaluxif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7f.bin
622a4fddebe1ecc78402ae157d15bb0d5e3fe60e18a5846269de794f9846a3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10912 bytes
font_01_sfnt_off00010898.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16792 bytes
font_02_sfnt_off000120aa.bin
4c2db503657d120f5b1ed11caa705e8f704bcbac3b9866337233a3eb0a06763c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16812 bytes