Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3ebb03820e28a…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 22:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7a4251e204b269f420e17aa1c9cb7968 SHA-1: 37519e8bc680a75a920ddff3a6219a4cd7e381cc SHA-256: 6aa3ebb03820e28a3611a2cdf2ca691ce454ea9ab353dc75cecba039ad0c83f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage existing vulnerabilities. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/apm9kj57iqek911141uasf54qi/budorumovulapezokikewu.pdf In PDF document text
    • http://seritour.com/rsm/files/44963540026.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4e01559e---35030813143.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/razorifuzune.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b522002ccd8---linikikurabidi.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/78f9914afd6647e426e6d9f069f2ae42/36144336397.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bddfad5f1---veset.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d366c54b2---50077277239.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd54ed380---tapobivaxijejegimu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8cdd433e---rixixabuvurenikibibapow.pdfIn PDF document text
    • http://sam-global.info/files/file/95372987319.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850c47c68a9---suzorotokibaniripez.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6879217375d859ee84c00c739517f094/zapiniwirilidiraro.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/96391978917.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697245a60---53639579186.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/44ec8d2509d4d440d0d38549e5e35615/dotinatidetoxanep.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607233f35570e---85034580457.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/lotixometoxo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7535129ea9d19bcf7ab92b3c19b84040/mipexojomubigasukifi.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xuxuta.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/birofafidasekesilo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/dapekofolina.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01589f0a0---99107897195.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01016ca83---60422239540.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/gegifo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6d8f513dd21dbd951288a49d92746ffc/ruzitafiwikopapifixadub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=barbie+and+the+12+ballerinasPDF 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
font_00_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 18648 bytes
SHA-256: e7c3d7aac290bcfab22bd4717d1a42acfe421bc1afebd49434643b1362a50902
font_02_sfnt_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 17324 bytes
SHA-256: dbbde6fd1248bb411a33befb5b336e0cfd5bb85e8d429a56c24b2296b2daefdb
font_03_sfnt_off000156cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CF 10592 bytes
SHA-256: 8b7f2fccd359bd56a449e8544ad9be1e9996a0e1cfa65a9193d3bd0846b2b453

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