Malicious PDF — malware analysis report

Static analysis result for SHA-256 2873f148be9e8a77…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7e56f7bc76f717572b6844bd5877692 SHA-1: cc42e664eedba75af7973fd63c286d05a51c7e30 SHA-256: 2873f148be9e8a77bc1d573cac6d7abc6afe64393219d7abc9ba5474f00a2266
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'formcraft' plugin URLs further support this. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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
  • 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://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/82915621803.pdf In PDF document text
    • http://stagelight.pl/userfiles/files/kutabafotomebusezatekexel.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/73242052456.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ad61b8fd---jolavidasepoj.pdfIn PDF document text
    • http://dmkert.hu/files/file/82268135247.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/surafidupakaxejex.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/natujetutadujurumozitakaj.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/sawizulijul.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331c7b46f84---zekonofunadugosibogat.pdfIn PDF document text
    • http://uchid.com/uploads/file/kabijewivenul.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/vozozin.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/wudedigulolibufavobasuvak.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/52706658117.pdfIn PDF document text
    • http://ymmicro.com/files/files/rolaxodegesotibisose.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/giziwedekevivogidof.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/19784878136.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530e875c44---sotetifosek.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/46665244283.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/63275147693.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/91959043974.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/xibawatigifub.pdfIn PDF document text
    • https://stormester.no/files/file/92420423697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+porngames+for+androidPDF 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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 10848 bytes
SHA-256: 785adc78dc5f3df88b0b6e4a289c485eba21ae12ef230f5f4e73cc260c8d30e2
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 17296 bytes
SHA-256: 36ea6de15523e0b491c1305d330fe05c0b89289589ffedf7bbc80dcaf329b59a

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