Malicious PDF — malware analysis report

Static analysis result for SHA-256 139dfb0cebb083cd…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 09:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72415657befe20098edb08f85c8ebcfc SHA-1: d8993c7d614e828e8ebf5494197b8484f5012379 SHA-256: 139dfb0cebb083cd2c26bd3c1b11918ddd07667a76e0f7f2c71fccefd7719e42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The sample also includes numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0ee936b6---18073367844.pdf In PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mozazemutupoxiviwobeboji.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/mufafifosumodefe.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/38188220138.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e315185a8d80bc2152e9ca0577513d9a/gajemetigoxi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/tixanabiroxoparilapowom.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/84867550212.pdfIn PDF document text
    • http://timebymtm.com/upload/files/resemawibadagoged.pdfIn PDF document text
    • http://artio.pl/files/files/jaxipevawusomedevedeminu.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kulimij.pdfIn PDF document text
    • http://epicridesnepal.com/files/donuxozo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/50717059192.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/donanawogakazonegoti.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/90171982588.pdfIn PDF document text
    • http://centrons.com/uploaded/file/12589641056135c4605740c.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/ledalekotuno.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/daropazobofazaketusow.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kepivupumexagewid.pdfIn PDF document text
    • http://scantech3d.com/files/15267834059.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613985f9265c1---sukujadalewokopagotimupib.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/sudafabikiso.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/46589706503.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/bopuli.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355090b2608---kojojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+popular+tv+series+online+freePDF 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 18452 bytes
SHA-256: a4ecb44d7861b7d2828b68784f1de49bfcaaeebcb0d2b7d66150745f0e65f524
font_01_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 10736 bytes
SHA-256: 70669bdc7cb190c5112b4e67e11e7e9c84787add21fae4af6da0a825ff6d13b8
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1