Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9b0cc773f5a051…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 04:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c341d705f1be846fce05f62e00f495e6 SHA-1: 441291d76ddaa6ef6437df74413e140615d08230 SHA-256: ab9b0cc773f5a051dace45d5183b1fe37bd5ad0bad2639f34e3425316e185930
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=panda+helper+ios+and+android+apk PDF link annotation
    • http://esoftland.com/userfiles/file/49201242997.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1f836d611---bowawoguxeko.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e1bsnl8edre93f8jcl0avk33i3/mowezemugiv.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/50568053042.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dodapoworosajo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b3f635aa0553c78c2ebc26466fc9a67b/79308302417.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/82683108559.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gidenipigalanozapo.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/pilotam.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuwavamajozosuzujamebagow.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xejugilujiberud.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c1371d39---setegulodibelobokob.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7044332960.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/69997414301.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76336829943.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930a926b4c---56287795263.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/48550420270.pdfIn PDF document text
    • http://yuha.be/_files/file/84039825161.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f78b3427---80493677180.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/tilesasuvowewoke.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/tobag.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093330e79bb8---lupij.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/37059140561.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/93221536304.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 18020 bytes
SHA-256: aabe056908d1a244d3469180ed5d47547d99b6bb0344020f970b64e32abff17c
font_02_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 10484 bytes
SHA-256: 5ede4b27d82ddf8df649ff627f81eda31d99f53941d75da84a9ab0f0b694bdbb

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