Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd8e3c5b14939d0…

MALICIOUS

PDF

98.6 KB Created: 2021-07-17 06:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d833e3b37685197159613beeab96149 SHA-1: 7cd56339ca13a574ff2231bdaf00dba3f01ec11e SHA-256: 8bd8e3c5b14939d0e2870f04fde04e59c6cb057fa2bc05d33e7e4667a6b6c6af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aliceinformaticasrl.com/user/pages/16614568100.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e81a4aef---fofozajajuvewebelarekuled.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/pafinonizumudojojuw.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/4474e4adec9b355e18c73f8523f2b1c6/nobitologesuwumiwefikuv.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/dopegekukagosigixumixev.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/b0nurvhmhqiv0dbe7rv6ra0rup/denorakenavuwesupesaxoke.pdfIn PDF document text
    • https://hirurgija.me//files/72701698133.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/dowibirapanideguba.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ln7afdve9mvgfnnosplapf2ho2/31738420413.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b6b46a2b5be8aca79fe6cf4a3d37cd77/ranafekekimez.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sesudaluragi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/67ee40102c5c08c0063008f597f2802b/xujorapux.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/49658088284.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/27825337597.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bd0b3121---dikitakuredopijasepax.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/crk1u5clcp345tu4n2pko2hth2/lofawidapur.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/sobexewa.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kajasi.pdfIn PDF document text
    • http://elma1.ru/!upload/files/duxipat.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/lovirelugunenozewin.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ef47bf31---89830541830.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e88ac9b5---94036022546.pdfIn PDF document text
    • http://esistore.be/userfiles/file/venaximemaxofabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=social+events+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 18168 bytes
SHA-256: 3e0bd88cd2d84487c77648a9a63357db9d044a3473cf71c39f0983c6e2a6a4a2
font_01_sfnt_off00013593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 10612 bytes
SHA-256: 3dfe2e23137bf7fab676ce4e8afebf5d8bf161484deca2206244b70f0e1530fc
font_02_sfnt_off00014dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E5 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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