Malicious PDF — malware analysis report

Static analysis result for SHA-256 da38851e50011231…

MALICIOUS

PDF

81.1 KB Created: 2021-10-09 20:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44a72354bf7a606206c7affb877b5dae SHA-1: da0d2ad6c1d99a61159d4372e59c5b50e2c280fd SHA-256: da38851e500112311a238f33d232154058a1255a207a6df1d5071b230b7d5afe
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, several of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gnox.vn/upload/files/bixoma.pdf In PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99548452620.pdfIn PDF document text
    • http://iphastkala.com/userfiles/file/jirigegaga.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/85059023540.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/vidabofelixoretanuvodixe.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20211001024727_c9zjbx.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/vefatodelumoxam.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/gogimumipitofezomepapul.pdfIn PDF document text
    • https://limsurdua.com/contents/files/dunafirolaxanite.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lodafinepagodetinak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615f52239979c---8720233215.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138161e58850---gufazokisujetapejigono.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mlnjstruhhtoi2hagrd525lf5j/kawefividalopu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/13640426315.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/zuvifisubudukuwufaxa.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/potezizi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/savij.pdfIn PDF document text
    • http://vaithun.net/upload/files/8324885730.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/57e9b81106d21e2d55168a20e9722b3f/57830169880.pdfIn PDF document text
    • https://invision.buzyhub.com/files/ledugeresirafidep.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/butakudana.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • http://budropol.de/Upload/file/lemadonogitodovese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=beethoven+symphony+5+movement+1+analysisPDF 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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 10836 bytes
SHA-256: 5da122634e354714b0f5ba0af0f1ad8ee29586696345479681e4290b1376e96e
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 17616 bytes
SHA-256: 28d52b61c8eb9ead85e8dee19ffff490bf31d09b67e7be8ccbcab5a56964f7b4

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