Malicious PDF — malware analysis report

Static analysis result for SHA-256 720b00fe5297b1ee…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 07:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 166223aa28f7a55edf659f4841d4aebf SHA-1: 0b715a6adafa350e10d9e98863705b9a8dc02c33 SHA-256: 720b00fe5297b1eec2a166fcd89c69f008f2c4d8dffae7a745f00270c7a86161
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to malicious payloads or phishing sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2d570f67---lavorofosuxifivelilu.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7b388e8---58073029573.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/64996973079.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/40093645668.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/93432837153.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c7beb9f0---77607713784.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca9f392ba---9660958439.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776a761f116---dipotutifidulolini.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3867d17e7fe25cf9dd502ad334b6359c/92106597009.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983c083be3c---sopuketatuteza.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1jlm1coo40acjpg62sakp2vhij/3351352790.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/94827230186.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b9716c788c73eb32af719d255d4bd3d6/mozumitilexosixozaj.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c16af16333c06d03a8a38329509f39a/tabalepulivipem.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/jabasarikexemadixok.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/64417140937.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fc6171a88f1e5d27105e7898134e1606/62833090029.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2eff0cfd0562aa877ed6151c1b6626c7/67025826175.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751a2e44350---kexibepaseda.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0c50c8001052943617df586334b0745d/66604836039.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d65acfd8f---nifukolabexukis.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/sosazepujologazukoso.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jefekiwetowunovegenojura.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/ludune.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/titulenapulomexiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=back+of+your+tonguePDF 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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16808 bytes
SHA-256: 3b421f3da5f3d3b52e409ee85a2d537e348fe7ba8a545a66bc7450d2a9f60c49
font_02_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 10564 bytes
SHA-256: b60fd0bc6f7a6b63bfa23f422452ef90fbc5d35553671248bea9c91716ac7e92

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