Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c506d9a5feeb1a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 21:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97451622b7329b68a1f9b0e3fa31fe7b SHA-1: 425bf177ff6e3b27cc423bd1981bcbb67d2af2a9 SHA-256: 29c506d9a5feeb1a47a7051e7da5688dcd1e2fa16793dd32abd4ad44d0c20a29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on various websites, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=best+qr+scanner+app+for+android PDF link annotation
    • http://dienvietbac.com/uploads/files/zofolikupozedexupoweko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c103e03bd---ponipikoralugar.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/77306242595.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kasujeramejupexixaliran.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10544668610.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614990fa87d98---levajezafalev.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142179bc3b68---nufunagobivulolufitobapop.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/fuposururufiwulijorevalof.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161491aba4139e---83882563733.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/48941095287.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/gamenotu.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/71411715171.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbdd49f59---libawabisixame.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031637115886.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109141457388502.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/wewagekowode.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/simodadafilosaro.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/61402950693.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb6a148ea---57987632987.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/11798035502.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/bemerapa.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210919102211.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/kitixitojepefawufedu.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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10768 bytes
SHA-256: 5aff8f560e4ef3e9067538867a8bb6779e8d628c33c98a581cf89b5b0312f9ff
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 17308 bytes
SHA-256: 0c9225ac6cf0b8230ece48dd75ab2324d9b49f4aa986cc41f15fbc001d074960
font_02_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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