Malicious PDF — malware analysis report

Static analysis result for SHA-256 f316261069cea2a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 409a9bea9cd9747280f31de95035abd6 SHA-1: 058128c169e140eb70e062f063ab5f42955cf0d9 SHA-256: f316261069cea2a8f3c032f0e97cf5e72d982b7e2f28c5cca477c275ad1132c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ystechpro.com/nbloom/fckuploads/file/temavunurasibota.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/96435527252.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/miguwezuxogadanuzakufi.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/24859011574.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/rujavepikupimixusabavi.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/34203548966.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/10166065871.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/lefomipeferulagodoke.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/50985875923.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tomanujixovelagetilosidag.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/botulorofulenenijepupemi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/43955453375.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1e47fd27---42952073551.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/39781613116.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348629ee0bd---80397063360.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/laxanazet.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/tolefipisetinafokona.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/fanepemuruduxabeg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qs3se9gonlb7v4jubuh75l7lud/jawope.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/riwobolikolapifumezofeki.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/33428751156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=random+valid+credit+cardPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17200 bytes
SHA-256: 532b62eab9667ea84e41ba714e30cde78ed1116ab8dccc761aea2875f92683cb
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 10472 bytes
SHA-256: 0293cf9c58bd09a2ddbdc17ee46c6ca5eedd814e3e3b5475c163fa304b16e864

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