Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b9f809f62a0dbf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 15:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4ae2fdee0c8709006273b271a817e58 SHA-1: 3584125697b2e79adfc7b92b54ba95b14c19a745 SHA-256: 25b9f809f62a0dbf7906d454481a88847057aaaa94f251200eaf25c0a2c34f3c
156 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 phishing and trojan distribution attempt. It contains a link farm pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=emulator+game+ppsspp+android PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614741c8d715f---2728375840.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/29976610620.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f20018a71b---danaj.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4a83d95c4---59834081310.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/4947746203.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/60615068321.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5d8clvls4gf4ah5sqq7katial1/43674858555.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jomogugafuxiluf.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109050806111047.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/62652181006.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/29035109282.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/nimosizaxerozowakixup.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/dunafot.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/jepuj.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/naxikurutureti.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/93192706046.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/kumeka.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/56628900787.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/zopakososulanelonuxuxag.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/ketibugisugewuvapajoxelij.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/17674495321.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luset.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/zarazuvepekoji.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/20130748701.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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 10816 bytes
SHA-256: 130efc89508fb06e54946c6e9f8909dbaa64fddaac954f20f3cdc62ad03d5751
font_02_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 14956 bytes
SHA-256: 6db98f5274397e61ea47194938c35c009d95753b745b74a60ef926216f977569

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