Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bd7a9e36543083…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 05:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96f0ce6a0e34a6ffa470bf1c7e68db36 SHA-1: f429327a938cecba678fa1e3a9f1023c91e6f3a5 SHA-256: 15bd7a9e365430838982c1f924210b89116d933d4307bcd12ae3655f52b73498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs are designed to appear as legitimate documents but likely lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=a+practical+heathen%27s+guide+to+asatru+pdf+free PDF link annotation
    • https://bjjewels.net/nbloom/fckuploads/file/teduwas.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/3993280006.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mojudagonupozevep.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca2d1dd69---mereme.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/45651055433.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/93341560608.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/17025569220.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/21954445682.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tevazovedifamosevukav.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/38097260200.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/45850323425.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305e663e2af---79179765814.pdfIn PDF document text
    • http://z500.si/files/venukerox.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/33894287659.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/gokogif.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/44960254837.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/robarirojizegoxepo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140e35c95b95---72598548387.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/nudixenobiliviverufeviba.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210913/file/ludogakamaranepiv.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/kuxesimum.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56107308961.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdfIn PDF document text
    • 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 18676 bytes
SHA-256: bde942317c12f2e49763407d7790e6405271ba77ac30e6c3a9074a6c0aed7089
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 11016 bytes
SHA-256: 94a090fb3bad97cd0b680728d7d32630f84c22458634293d178e34bb62ee3375
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1