Malicious PDF — malware analysis report

Static analysis result for SHA-256 633bf2d0c0d27d18…

MALICIOUS

PDF

106.0 KB Created: 2021-09-03 02:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36bb45ce27b354046ae0e0457a376dd7 SHA-1: 6b00c6928e0a69b3d0812b7b99e5920b301ef1a8 SHA-256: 633bf2d0c0d27d1832626fe81e8d3684d59db2302dc3f9d6f3300dad95607d2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to PDFs hosted on various domains, many of which appear to be compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext by indicating the document contains invoice or payment-related language.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garraldaarquitectura.com/garralda_userfiles/files/78968846980.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609826bbae77e---bumosojesu.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/51247104803.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2410bb1034---89155994636.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kujupifogetoduk.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t31v44688452t7ioskbkjliho0/jugod.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/50866337773.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40da876253c9115f73dbc3ade930367e/rodutukakakabalom.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lopefelemezuvasunajup.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ce44335c6---3557633329.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9aff20ff8.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/t3vtk5u87i6l05143hcitt7uj9/gomazizaguzesitipapimolon.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6131be2181---28751803074.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161188431bd933---59613961536.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/6594743040.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/221419586506.pdfIn PDF document text
    • http://mesterek.net/tmp/63244741977.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90beb08ed4---70240126978.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021083119050591.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zixagi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cgfafdcuvv10v2vlbki33qsn6r/90555566437.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ef8da6fb58345c02d71ad3e1ea2fac82/vixubakikujowupawazovudo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b6454ed47387a96b71fa304ad018177c/48595201692.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51ed2e2d4---25566163948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=soal+pythagoras+smp+pdfPDF 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
stream_004_off00014ce4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14CE4 17908 bytes
SHA-256: 1f351311d3db9ac013accc8c9887ef1defb89f0c66014b2547a64812eb7667ee
font_00_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 19084 bytes
SHA-256: eb256e896a702ab425d24eb711732a357d160ee546ee09018ad1249dcb48c41a
font_02_sfnt_off000168c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000180e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E0 10808 bytes
SHA-256: ed0a424668abd82e005a938be27a06237963abf3ab50d4e90317b65b10f1f593

Open this report in the interactive analyzer, or submit your own file for analysis.