Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfee9750f92e33f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 11:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f8b9b67ab1e0ca32e141678257f5c09 SHA-1: 9a4e15430b587bb321214edee955690cee3a66be SHA-256: 1bfee9750f92e33f6e19f53fc9da463657fb2dff145718103d5ef8dc5401793d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document structure suggests it's designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=sexy+android+games+apk
    • http://starsunited.at/upload/files/fasatudu.pdf
    • http://writtenmail.com/upload_images/file/77507252592.pdf
    • http://el-system.jp/uploads/2012/files/zobapa.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92207c770---gixusogezajulenagixokopen.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c9a67511---kobejetagabepajifodusosow.pdf
    • http://malachowiacy.pl/files/file/47286310461.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tfna7avggapf2l68rvdi8uruoc/70454718114.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4n7qd9qca6gr3vkuccgqv2toh1/sabudilemejajavefuxewedu.pdf
    • http://ibtaker.ps/userfiles/file/nekijoke.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18074c2df---gijisobagirixifuw.pdf
    • https://linker.tw/files/22790720487.pdf
    • http://quincy.pl/ckfinder/userfiles/files/dusogipipexoguwovilemif.pdf
    • https://506hlapeta.com/files/file/danigoxilatatunipumirej.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077751de9246---litubegunopago.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/280fa908a52f66e51599118a83954b74/54239158387.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ed82006528d010f49916eb43bb35f046/wudokirixeji.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9erdbef4vsk4rlku3t8uqh8l8s/dimoguti.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/232b7756a06cbd2ec303a5b8c791e9bc/84777257430.pdf
    • https://fototipia.hu/files/files/5546715421.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/4568741557.pdf
    • https://tipresentoio.it/images/file/gugevosuvovakavegeg.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c445592b08---79751699070.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7j9qjv8fb8k7s1u8inbfo22l2t/67472605158.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a7931d7---vakajukuwuwadut.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_off0000ee60.bin
e5214e9fc6974945f03cad10922090c3726a230923b7539b93a5e2a4388557cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10972 bytes
font_01_sfnt_off000107a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
font_02_sfnt_off00011fb3.bin
c83bdf6265119b51cb37eb8e62704e48067150fb9a5a2908537cea47a4ab19f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16436 bytes