Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d6ebcb1f41f9d0…

MALICIOUS

PDF

78.0 KB Created: 2021-06-28 02:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8710d87bddc7df3c56d03c0f86fd0075 SHA-1: 8a19b706bbffbec3466a4feaec858a65a7726068 SHA-256: 99d6ebcb1f41f9d03118ca2da441bb55677ef26bb0093e90ad5706643c8add95
132 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with multiple URLs pointing to compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript further supports malicious intent, likely for exploiting vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

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.
  • 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
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb2adaa18---vosuvologodakatuwevibiw.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/febarutedidoregutokofikak.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/khcu3q24gbggr50eni1mahvc6i/wetilaxidoragugifev.pdfIn PDF document text
    • http://gloria-eurex.com/ripufaxope.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce36f6dd83---xananobagotes.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1aa07f6356cff8af9624ac4c16f39783/xuzowusorena.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/sotilugorekewakurod.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5dmi4adk4ehi9kvnbqr7cr31v0/masuvoriwav.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb238ca77---lujeguji.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424f96dc96---sofokatipoxitosowu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d1e4fb24---42286383019.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b208d6670e0---feniginigejepuropatesumom.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d797ea4f4128971511e8edb45cedee34/67739045895.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811e351f1ee---zivobivekosigitavelafax.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/fogaguti.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vojuzupozozam.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d2aad40d---mizoxilosedugigugin.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/demikogugarozekesekorokol.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/89047221045.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/76287496520.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/71212597719.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756b1707910---nuvanir.pdfIn PDF document text
    • http://93564497.com/userfiles/3073799811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=indian+history+in+chronological+order+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10964 bytes
SHA-256: a6a51fc11d3be676c97f084255127b70bf85ccdd49b568df5ca782119fa8aa98
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1