Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ea100de92060d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 22:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8a8a8bb283bfddc7cb0a46a3837b4c5 SHA-1: 4fa7990613ff0c4db1807aaeb0856b936d25b3b6 SHA-256: ef6ea100de92060d24c36de91d114626a7396a1264d3734a739e5a9f9f0e671b
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=pokemon+heart+gold+randomizer+download PDF link annotation
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a141b7503464535efb69cc354667a4e7/60814377482.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/75095901039.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cce118f4d5e0d2eed7d3377a3483ebdc/4868326032.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xawizerafuk.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/64476288899.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/6186119969.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614112ae5c849---73173604367.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/nivisufenufiga.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/wuguduselefa.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/6069461473.pdfIn PDF document text
    • http://we-plus.tw/ckfinder/userfiles/files/xuwodupirofexalobeworeso.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/fijolomirevuvij.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/duwewuwadolepi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/boreguxujatesus.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/70810040957.pdfIn PDF document text
    • http://yuha.be/_files/file/84664090467.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/61013821487.pdfIn PDF document text
    • http://stylekd.ru/files/jopakuwin.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/11927722417.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/radawi.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/36635726764.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/62502607994.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7898c45d---40522820552.pdfIn PDF document text
    • 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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10768 bytes
SHA-256: 95c8cfae16fbfa4105b56c8e20a6371a9f358cf80eda2542dddc6275c64d921b
font_02_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16872 bytes
SHA-256: 974c900cd734091bdd7a0c1a883d780238d3e350e60900dbb84d459780d3cd35