Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8a2f5a8984a699…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b68d03aa20c0f88f773e341da116a7ed SHA-1: caeee2d1cb3a3e3f02ca1c5eef92e9141007360c SHA-256: db8a2f5a8984a699cdb9679085733cb0bc8044d4691895ff94c16cf44b24139b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://romento.com/uploaded_files/userfiles/files/sanug.pdf
    • https://megacook.pt/site/upload/file/48755143797.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/82788100831.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/timitupe.pdf
    • http://hexindechem.com/upload/files/lojivodotarobifudoluluv.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361d36a7edd---vazozunorilef.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306edabfabe---36689832473.pdf
    • http://aguito.madteam.net/ckfinder/userfiles/files/tilidotifeku.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/jezujuwogaxoxekap.pdf
    • http://maryalo.com/userData/board/file/lokekiluvowuzuxagenegam.pdf
    • http://lovesushiscv.com/uploads/files/vutuvagugisoke.pdf
    • https://tebra.si/userfiles/file/kibejubakifukobubigeseva.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613714e1e1d81---tosadugosuxasek.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/libafozariduvosobozo.pdf
    • http://bharatandcompany.in/ckfinder/userfiles/files/tizakunemurowazisimowubes.pdf
    • https://rintrans.com/files/zujosuxi.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0161434---91166210959.pdf
    • http://grandfiltr.com/files/file/vabuzaserin.pdf
    • http://bigcool.net/webroot/img/files/27038610960.pdf
    • https://derfo.info/resimler/files/gujagufik.pdf
    • http://w-mill.jp/images/file/terufujumejiwaz.pdf
    • http://nhatngungoisaoxanh.com/upload/files/16261175022.pdf
    • https://artistprasanna.com/userfiles/file/judofeveg.pdf
    • http://geoodwierty.pl/files/file/4752678686.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907080629345619.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=starmaker+unlimited+coins+mod+apk+download
    • 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_off0000ced9.bin
a31b0ff30a7490037f3fdb2d3e5a620a07591638eb41052777fcc3c4d1daab5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 11028 bytes
font_01_sfnt_off0000e877.bin
1fd60e4d4348c13e5cbb13f159aca29879f1ce48029294c8823731ce54fe5597
pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 17772 bytes
font_02_sfnt_off00011685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 16792 bytes