Malicious PDF — malware analysis report

Static analysis result for SHA-256 837a3453307e4552…

MALICIOUS

PDF

159.2 KB Created: 2021-06-10 05:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ed70e35bcc22fc7cf74dce60caaed271 SHA-1: 387323d2a3273cf31e21928e621ae544455872f9 SHA-256: 837a3453307e4552703616c44c3b0366f2b9d314e0600e1fda2e8a29a0782986
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pixomot.ru/uplcv?utm_term=vocabulario+de+teologia+biblica+leon+dufour+pdf PDF link annotation
    • http://hzbmsj.net/images/upload/File/81468565722.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/35011152039.pdfIn PDF document text
    • http://nktrading.qa/file/files/81585832204.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003caf8dd---82530350678.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/wakofamazotenutatobujolid.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/73468613144.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fe37d649a22b4bd213a5f3d2a5c42b61/3119066799.pdfIn PDF document text
    • http://sun-eko.eu/files/file/1853038522.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/78512018647.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fc638b1d---94099679494.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/amur3vg04ot3g1isv2p3jutoq6/tekuxetuj.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f1008000---bupijudiwatos.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/6ebca03b8280560fe4fd592a448d351a/defimepevinudin.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18126077975.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b938e4dec6c516c281def6e66bc33eff/50361130414.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ecde88b1990de3eef7cdbb908554149a/52307306169.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ebadf49---21031426187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000240fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240FC 5248 bytes
SHA-256: 26fbeea4fdc1764cb41e08c2fcc46a20e22a3fa2a3ee9a6513bf57d75c03d408
font_01_sfnt_off000252e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252E5 14492 bytes
SHA-256: dcc3ef1afe9001369eef300020c5d079de16d92e15ce9db1945668437cc3cbdf

Open this report in the interactive analyzer, or submit your own file for analysis.