Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b23e3cc1077b3ab…

MALICIOUS

PDF

79.6 KB Created: 2021-10-05 17:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 083c6b21cece2c538cebc0b41fc707e1 SHA-1: a0cc36d1809f827c92a4367bb1cd52d4231265d1 SHA-256: 6b23e3cc1077b3ab04010e5ed218c436ff7b7f9ef8e091084d5331fdef7bd999
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content or download further malware, aligning with a phishing or trojan delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6c32m3mft091e0fq5ccos4fug3/xobijotegos.pdf In PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/92030201825.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kukegenuroxewuxinexuto.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/99402325030.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9bbe992033308cd631decbd50f405d43/walanido.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef18343c42---bitipape.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/3093055947.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/98876740463.pdfIn PDF document text
    • http://apple888.vn/luutru/files/65465133890.pdfIn PDF document text
    • http://4rrecycle.com/files/file/26204144725.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/38506214167.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/12381506114.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210923230604_1376432795.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/28773313448.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kanagerovezazanodegixunuf.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/58092366476.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/rodirivojumuzobak.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/10775010557.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/gapojigexidaxinevenoke.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xagetig.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/pujovenagalagudedufodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jee+2020+previous+year+question+paperPDF 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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 10860 bytes
SHA-256: e38d964bd4e5bd83f68d07dfcb14972c028cd4f61d5e54037bfb0bf8e77a71a2
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 17968 bytes
SHA-256: a4156ba40a5f6fdd2f0cfed2dc3b079259eb147201d7fa6820cffc854ec9a10b
font_02_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1