Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7a7dbe11620f50…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c95e24e036de26748f60a866d25fc06 SHA-1: e1e92fd6bae6d2550bb7df22b11e41545a83635e SHA-256: fd7a7dbe11620f50edd96f94dfcff6a315b3b605329d801673014e02dd02c0ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://istanajp.net/contents/files/gunomof.pdf In PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/70162236397.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630763593_1.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/19885042710.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/08297a495385180109a33a97c0ebeac2/nonale.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/guvubofeb.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pesafetisomozajozubifenap.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/69141256616.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1ff6ee9a---5197587112.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/33900199383.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sutujibexaxonanobawo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/19840231137.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/86641997509.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/64709175534.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/54964543499.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210909170622.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/ximabe.pdfIn PDF document text
    • https://shunnasato.com/35449694828.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/22583663141.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/jedojikefamenok.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/72186418786.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18612605620.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac961b0d9---76205697456.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/50536991946.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/2961676974.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/rezowofokimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fortnite+free+gift+generatorPDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 18300 bytes
SHA-256: 0d78d87c37b17d5f98af915b375265ae9c8902c34b71a15132a75c336f93641c
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 10152 bytes
SHA-256: 59e5d9868dc83fad3ff438bde7bc429b268023b50a020f57988e0afe9ad7a8a2

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