Malicious PDF — malware analysis report

Static analysis result for SHA-256 5510f8a0f0fe3170…

MALICIOUS

PDF

87.0 KB Created: 2021-08-21 13:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56efd0bea470f5c68c977528aa8bd07e SHA-1: 1999ce0bed63b8d3f8a0edf85e413386f64ab771 SHA-256: 5510f8a0f0fe31706c835be6765dea5b0042c299d36c633ac16a427caf6de3c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607238a3531cf---mupowunurusoxikawetaz.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efcad5a7ba---valevidogijo.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/36299631783.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/vazavilifaruraroju.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/lizuserinozerufodabubus.pdfIn PDF document text
    • https://ever-progress.com/upload/files/vexunuvesonuv.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/tuwabidibifobino.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/5755505460.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/77318357638.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/pumalojirififapewoj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/puzisipofek.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/78988294465.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd065c0f7e---gazanavazosinagilewenuk.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/sesabiweged.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f5090e469c1c5ee72c4ac5afb664da10/52413049243.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/putoxomavuxa.pdfIn PDF document text
    • http://mayjack.com/upload/files/41473170889.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/84810274230.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/lovosigowusisuwus.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b1b9b7c7---zinunovolabirivi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lidowofuxujibun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27ca08c88ab4a945504df979eebd2da3/rakodopamowidutogoseva.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6fa988cf9a46316604df4bee6ef81f72/78744678059.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/xegirejalina.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ca698ad1810b0a3f91dbdac17982e25b/43042154505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+hunger+games+full+movie+tamil+dubbed+free+downloadPDF 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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17132 bytes
SHA-256: e4da6d5d86c03a250422f39950c16317fe653c52b4b52c6a8d0aabd23719cf7b
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 11156 bytes
SHA-256: 518d3fc714e97ec4e5f9ce43c3fb639af03886e4d343781754894953fb01111d