Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b753222532b2c8f…

MALICIOUS

PDF

78.6 KB Created: 2021-05-18 02:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: beb056dd881544a6d5186a162d745112 SHA-1: 21c2f8b7ab00da8ea7ef68f1cb99f623caa82d6d SHA-256: 7b753222532b2c8f4f309ee2e9575159b2aa6a3ab6eba7f8b287a16ef12aa00c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting further PDF files. These links are likely intended to lure users into downloading additional malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398587d497---30877489175.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e934661---34389849465.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jujojixaxijotuxo.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86522902550.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/da81bb36e3b5eeed70283af39d9a34d4/kugejixevoluzogewi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e5a282eb---64437441489.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/btlck3dlnupvbhuo2egbdlhg1u/55513802339.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/11182284543764ed8d8c14cc1b4bd3c9/munimemifagobolorinibi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/butafikapuximumomexoxar.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6078d5323---tikedexiguwopuzu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071276ae76---60927289702.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/54749542600.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160923b5a10749---14199252916.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/sewevofax.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6592c6d7---56480737361.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/689325262ef77b778da84e792a5c46c8/81041011365.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708bfc16e3e---73870237323.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/82867002905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+type+of+hydraulic+fluid+for+forkliftPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5020 bytes
SHA-256: 37af9dacc882c9c74a91f210f82e89310e9293ae270ce69d0512b9058de21293
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10664 bytes
SHA-256: 35bb56d64ff03508856e2faed69d1fbba17bc5ea3a6e73e3c2115f04a671795f
font_02_sfnt_off00011ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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