Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9844fd0e14a9b6a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8727df4dbe2edcb3f3757c87cc589167 SHA-1: 6376754f838d800444a6003bd1a49edf9e168984 SHA-256: d9844fd0e14a9b6aa02b1421f18febf5a97fea153efdfb8a79ed3fe1ce9d7b05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://krisoc.ru/uplcv?utm_term=the+sims+4+apk+free+download PDF link annotation
    • http://le383.com/uploads/files/waxugubakiwezav.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1cae3ed307e5353c95d62878ce8e5295/witedebumen.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/30290158045.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/1422720556.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527f416bf2---53660514748.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1lbheq1u1iffbh36qvu532hrq4/96807427692.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/regufizedab.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/ropitadeb.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/tizudop.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/675e2d400cfa5b8cef0ab6af280ad072/83543345971.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ffaf3b712e9f2fdd59906514d0405c0d/64643702202.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/76591563983.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/36439636219.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/wamakunurujepi.pdfIn PDF document text
    • https://europartner2.pl/uploads/vipujidivipak.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c20b4778a5b6f00776a31fd4df3b8d2/39393125275.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6ff158f---10494591207.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/46572781772.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/vukomatujin.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedf19744---wevuwexawidumujapexow.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/nawokigajopiwopuk.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/werutetapetenudetoxoz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140298fac9c1---todajalubidutodisubox.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/34270361706.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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17488 bytes
SHA-256: 3351ff37f670a48ade28ed500f6bad27ab7b3a882e6c2538656773e6928fd359
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 10884 bytes
SHA-256: d53c14a365a8f608056681c83dd74ee381a3de143d117cc189dbf7a1095cb95f

Open this report in the interactive analyzer, or submit your own file for analysis.