Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c3c6c0ef0256d7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 01:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0ad8399a702ea469041bb35335be3f9 SHA-1: ce9e72cf7de015c201aaa4c36827d82799e21c33 SHA-256: a7c3c6c0ef0256d7058a044a3d62a058eb173941938b8bf7df7a7598dc4e8f10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site, contributing to the overall phishing and potential malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/17971206307.pdf In PDF document text
    • http://emannsltd.com/userfiles/13701280668.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/33637550840.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/47841008226.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/takelexe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141396ab7b85---90847567440.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/desemoradoxoziradoz.pdfIn PDF document text
    • http://health-bridge.in/upload/file/vopigezuzamaludidad.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/37390928745.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54333446296.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/512d4e68b9c0ae0819f98937fb533104/samovigilozizagonujipaxi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tonatixuxokuf.pdfIn PDF document text
    • http://sushibelovo.ru/files/29915179030.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109081152299140.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/59056615732.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sejiwukorefudaxubabi.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/begivepokixisojukolil.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/kuvogilasologomotavuzepip.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210911205909039127exy02x6iulw9.pdfIn PDF document text
    • http://nscenter.cn/upload/files/61602661400.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/vavaxelovinebukijiji.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040936301196.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/1726061188.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442f994fc81---tuduwozebijemezivafu.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210917_171326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=latest+version+of+tubemate+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_off0000bd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD89 10884 bytes
SHA-256: e5adf2d597229ee605e8d1c9e71fe2312f1eeb0fd4cd62e4ca7a23074d131437
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 17136 bytes
SHA-256: 51f8018d997ae1eab5a647bbbc0182c97f7d3956670874b0319286962550b2c3

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