Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12d438c8e159fdc…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 15:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 592e77be905dd8655f2b386fb295f92a SHA-1: b70de9cb906b5c280971c45b59a8554bf7a157fc SHA-256: f12d438c8e159fdc49b195defda423183124db44cbda5eba0b105fe495632aef
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised upload directories, suggesting an attempt to obscure the final destination and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pkrmhkprq2aqf4uigkt9k6q1t1/98173206260.pdf In PDF document text
    • http://adacu.org/userfiles/file/20210920100702.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sikeniwum.pdfIn PDF document text
    • http://oodow.cn/upload/file/210921121526481732lcgdow21az73.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/ruluruzarozosepe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e7d1a4cc---rujotogisebufoliniwod.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/5236818189.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/feec6c8827066079f751e418220bc560/84099447270.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/bamefekug.pdfIn PDF document text
    • https://mediaskills.rs/files/47942130280.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/pezuwufezujuginurexera.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/93168438147.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/tipelojajixududi.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lededejikilamepuzituwa.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/80735649128.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/21825803197.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/62645497084.pdfIn PDF document text
    • https://amgaa.org/temp/files/90652534111.pdfIn PDF document text
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/54559947879.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446ada05b64---dirujojivom.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/lumimadikavuwija.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/bivusimewireramesam.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/62408007465.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/37090603469.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/10816141113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=despicable+me+2+full+movie+123PDF 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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 17664 bytes
SHA-256: 9b8d9d251d7055a27cb8b93569748a2fca8de9481e5f04155c2383166cb08b2a
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 10988 bytes
SHA-256: daf048cb3b5eb001b5f75266e61ebbb5aa0a118c16b5f4c8f29320c74e0b8c7c
font_02_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1