Malicious PDF — malware analysis report

Static analysis result for SHA-256 def0c1612738bc84…

MALICIOUS

PDF

81.5 KB Created: 2021-08-23 11:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a17fabcdc89f626c56d1eb60ca8f62aa SHA-1: 6a17188cdde695a158c9cb34a72c83f8c4188825 SHA-256: def0c1612738bc8462849cdaf16889b6adba6ce39c338e5502b80e7843075dd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute further malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links indicates a multi-stage attack or distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b562a1853687f7aee28b94d638782fce/2155355587.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6229c314e0357f08169ce839b39ee7dc/62784601058.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/30893508133.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/45728113430.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kajajeletar.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d7aa7b274c9996b28ffc160c64a6cdf0/sogorupoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1d798ce9---sabigumekagepawin.pdfIn PDF document text
    • http://dogable.de/userfiles/file/63073316092.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s6i18jelbi94t3pmo3g18rgqsp/nekugun.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/ledopege.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e4a7faba9ae5a3ffd081d121a9f3db8/861657540.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5db7686f22d5b51b375ae8aeb3c3d735/18566693983.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/ziked.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/lofitise.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rahbecvevqt827514av4hmg8i2/zomunabir.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/bogat.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d2152a2d---tepemunilapov.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/49475864677.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/948692204cb417956b4a0cf7283d8448/63901226135.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdeb6b8e697---61812371127.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609761475af34---botajidam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=direct+mail+printing+servicesPDF 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10664 bytes
SHA-256: 379b68690b43f8eecdfdf96aa6dcb333ce92bdf451e3ecaeb619598c0fc39aa1
font_02_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 17068 bytes
SHA-256: 860a80cfa1b7690376ab56d9763f2e6c1ada07edc9a665a2a66a0398cba3cbdd

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