Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b46e76f94a13e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 20:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fe1c891be4b2f4764229f1ba0f307b1 SHA-1: 4d27589dd23e8f0382a94de7ff8a51fafb377c68 SHA-256: ec6b46e76f94a13eb976aaa6da1dd2dad5f15833acdcc4b62d7df4841fb2557f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly indicate a phishing attempt, likely using a lure related to 'redact pdf free reddit' as suggested by one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5009892482---24811530876.pdf In PDF document text
    • http://ifa-astrologie.de/userfiles/file/dafanumogenewevodirodugu.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/linexetuzexusup.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/gabawilus.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/93426730576.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/89fe1d6fd10678c3dd47234644e774c1/tanar.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/kuligipizimo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee3e36c58---nodijora.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c94a8e7a---80332486544.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4287d7eb276c0aaba10405931d3dc54b/73326610713.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/12453298672.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/45705602813.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d46ec6f1b85a6432fd4ba7a730c85818/42727342645.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/jesokodapopokezurilig.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/21399293229.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5nbcid1bcok7kbkggotri9sn2u/pisaze.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/db2a2d40c2b63b6c11cfd8e0115ad909/roxoxomodosadutatinamudof.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085116ec05ef---33225805031.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0cb8njnosnk94fppqfiqark98r/80250967813.pdfIn PDF document text
    • https://le27.fr/docs/file/mizigole.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/sufonawadarate.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/63849655837.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/37956653059.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161238adae104f---30707644409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redact+pdf+free+redditPDF 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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 18544 bytes
SHA-256: 417cd3c88965cc89c5a09d9be9d99ee219f422bfd3e24e9ef71927e20a934b89
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 10220 bytes
SHA-256: d2746227dd84d1fcec45b9990fd377778ee82f292bd81994e383cdf773fcc970