Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd89284b591ea770…

MALICIOUS

PDF

99.6 KB Created: 2021-09-12 13:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5ba9dc0c1c8d2bac66191876c880dbd SHA-1: a52519cab9b150f452511611d2c9f9b060e1e80b SHA-256: fd89284b591ea77087544bdacd39b6777e37b19ed22d78df08356b51e3d419ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://iqrainternationalschool.org/_assets/files/5000233877.pdf In PDF document text
    • https://warungmimpishio.com/contents/files/babut.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f803479f---29159226575.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/kozuvulesodagom.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/59564828981.pdfIn PDF document text
    • https://windsbs.biz/files/file/migimokavozipubexev.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/kudebuvoferimis.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/tesogudodofugakap.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0c54ce2---piwobenapanerovikimupa.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/76061251721.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/67077113681.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/53521660932.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zitirimezupineli.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/12371844436.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131086ccc9b1---68251641274.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/bewogikupepilasigivafixeg.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372640d13a3---47464475309.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/17370425514.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jorepobipa.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11587877803.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/92793199228.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/ruferibopomiget.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/sukinofibol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+100+123movies+season+1PDF 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_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10624 bytes
SHA-256: 23d37846921936ca920f510a1d2c9dc54f7ae1a03e549a1fbdfb25498913a6a2
font_01_sfnt_off0001364f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364F 19152 bytes
SHA-256: 656d89c74fad57e057aaa6011419bbbc3f36924491cd99b2c14aec80c54f6c23
font_02_sfnt_off00016904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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