Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11e9c8450750a6d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 11:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 122b0be838731f95185dd551b86565e9 SHA-1: 27ce60fbc73f8dcebfaa5be79359a78e2e9e3f1e SHA-256: f11e9c8450750a6ddbd316d6aff75a173060e25acf95a59ba2a11ff8846d5555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://terezmisszio.eu/files/file/81335185227.pdf In PDF document text
    • https://elitstroycraft.ru/source/file/xewuzazodejekip.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/98675855465.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xudinufunupisazirerebukiz.pdfIn PDF document text
    • http://topstec.com/d/files/49825447204.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/jerizamupuwumeletedivudom.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/82033407893.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/xifefoti.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/71385558070.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/guzisunesinu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/vebetixanu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/mosebu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8de6fab9---xuwewodepo.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86793880234.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rarujirinuguvi.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rawirogosaxetagos.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf95d2faa---58047204600.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/20726cb595b7d8a8cd69e8c8e46ecfa9/40690854030.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/48803716519.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/wowonixowulif.pdfIn PDF document text
    • http://innotack.com/userfiles/files/20381658141.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae727e5a1b---riwadapirozaxovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mortal+kombat+johnny+cage+2021PDF 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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 18192 bytes
SHA-256: 9926e34e400bea6a3d8077b4272bb65d594a1d3bbca3eefeaf89df32633d243c
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 11180 bytes
SHA-256: 3598f01a52e21bd494a1e7451713d7f500cf5fd9c518ae2e1486d0b6dd74ba1a
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1