Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb43146f92e1ec7…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 05:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c2ce8546390e8ef3788c18a896e25f8 SHA-1: 8efd9f4b5c421caff336187219261e852266608a SHA-256: 8eb43146f92e1ec71ceb7d2601658575f6c8705d55b41c32191f4a1291040e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9991

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 http://er-trans.com/img/produkty/files/bexofag.pdf In PDF document text
    • https://eminesenlikoglu.org/resimler/files/89678732095.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nuvageni.pdfIn PDF document text
    • http://normel.org/files/upload/file/soridimejotediromaroxufum.pdfIn PDF document text
    • http://cortabellanews.com/userimages/purafuvuwize.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/85970e53d80cf208bbed843d23f01ece/gaxupurinujapu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kunijoridotugumabafo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/88395586431.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/60815695247.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/58500999826.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/82988503341.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160782bae2306e---kidapunekav.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609916c246d7d---suxoxoneriser.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/faxobukiwiw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i82l710f1qmo3ekekhihfs44cl/zapapobaz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/91073629207.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73342d7c0---wadofagojelu.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/27220952422.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/rikemerogomuzugerabuzun.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a46769c3437---zudema.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/loxufenifevinivapowiz.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef221106c---ditet.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+lamo+meanPDF 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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10312 bytes
SHA-256: 3918e4b19a84eabc54aaa22297c2aa3c6873a337576fe697f7581e0d32d18976
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 18868 bytes
SHA-256: 33ac1574072ff403027392c6a55c89a499d395f2e3a866b8a66292a1314c920d
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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