Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cb6498568be17d…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 14:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a298ad70ee4b7a10973ab27e1d4b8e8 SHA-1: 41c2b057b0eb0dda1f6a882a950465151d75f8d3 SHA-256: 26cb6498568be17d3470d31d1d855c436f87a2b0a35d4a153bcc11263dde9237
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/463619b6cab4bee4ee387877b04d2356/jenegozobewigipep.pdf
    • http://a-kamen.com/userfiles/file/luvatoruzejud.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/kenidikojibaponutoja.pdf
    • https://gadd-asso.org/userfiles/file/tenajesodolixawavavukikum.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0342e1a5b5---toremixobefoleg.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4049248a55ed07419b4a8ff4599c589a/11092580691.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gu63vf8mvd2713568lmju4ohg8/19407221172.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/pidifuwumuvil.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092626cc2c58---89541107945.pdf
    • http://armanetti.com/images/45385090955.pdf
    • https://cornerstonelaw.eu/userfiles//file/lejapakolawakuruburu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/itrro3m5gs6b2ahauhq4f42lu5/62260268925.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921144e04d---tamozijazon.pdf
    • http://446888.top/userfiles/file/silajaxexiluzixemelanavid.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49ec8d598---89387618860.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bapuaaofogco0tmal5mfl5afi0/81394596807.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e4cac4faded797e29036645e16816d46/fomexarexejemepimin.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/81c77c8c52d5105d30737f6e638f7cc0/sesezumupivigolimitazono.pdf
    • https://arvikabc.com/images/uploadedimages/file/13592060953.pdf
    • http://taiwanglassgroup.cn/userfiles/file/14771429005.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/p9d3lkhejfsr1193gt2jl3sjno/rozixem.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d12da5a2---muxekuti.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba19f22d566---44326228501.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2nd+puc+economics+notes+in+english+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin
50804c8fb483682c81f872ea1a3920196b4a13d292adc3fd15aaebfb4c344940
pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10928 bytes
font_01_sfnt_off00011007.bin
8013a6f6d1f4eaedbd700a0d36e91a38b78cbe243bf17efa7d82388b9117c91a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 16736 bytes
font_02_sfnt_off00013bbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 16792 bytes