Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe0d8bdf90780b0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 04:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91047cffa77f7fadafb6cce6993705f1 SHA-1: 83e4cb1adedb2363b6ff2773dbd1924bd8cd0d88 SHA-256: 7fe0d8bdf90780b000c26558db686301e95afe30118f5e3eef2393d7832825bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to distribute further malware or conduct phishing attacks. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9498223a20e1f1920fd600fc93cfbdef/76992699704.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3bf333c3---72897015400.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/72422964218.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ke2saggl507ipdj7ft06f480lu/86934708249.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/perapo.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/bagiluxunine.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6261cpfi3cdsbfcur3a77lp5cg/ketitibi.pdfIn PDF document text
    • https://brukspec.pl/upload/file/2101377468.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/gikakaj.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/89760161799.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/87070268591.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c132a0e8d---50694219062.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f587844a---pagisosijobexulowazuf.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/44934527314.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d5a0ad30934b78e8655a447eca2ff5ad/59960074602.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afca9e4971c---39086825070.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a99a412---49219032053.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf7a9e626---tutetokot.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xurekezovatupe.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nifibosu.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/faredimaberutigovewixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=outstream+video+examplePDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10740 bytes
SHA-256: 4cca5f3d378c5f7aa9f94547b8a51b13d60cda8028bd74386d407128f2dcb492
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 17888 bytes
SHA-256: fc521935eca02d6e44e4926f64c0b2b783db61d5767016fc818967e1a824612e

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