Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d2bc1af669610…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dbada50639fbda443e5ddad03ab9192 SHA-1: ce4cc6492bf5588088fcbf48057df556d4793d93 SHA-256: 631d2bc1af66961020483b9e539cd6cf1ffbc36356a3fbb49a3a3d1895d23a9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into phishing scams or download further malware. The embedded URLs suggest a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=no+verification+free+tiktok+likes
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee267cd32---65869733928.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ac7699f15238d7f1fc0e8ae573680026/86410593560.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0006ed68d---poluru.pdf
    • http://utuin.net/files/fckeditor/file/defosikevevewenimo.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/665a0a17a2b7ab3ceeb23611f1e6516c/jirodopega.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb60594e86---67132864542.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7dc124352c8a35dd0fd9c1603a7809c7/wovevubakuxerefal.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/jolabuzenuso.pdf
    • https://weeb.nu/userfiles/file/sijetuvevab.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5dd5ea14def7a9a2a755ee25795f1462/12921491222.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/95d4e76462df1d41e5b013485ad18783/fozekiw.pdf
    • https://noddy.nu/images/file/fobibazixujaso.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e929486cb5908dc5fa86f5003281f173/86397951394.pdf
    • http://bright-inter.com/file_media/file_image/file/zukididur.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/79f47004128e31cd80b8e9fb9ae28ec6/xufitutawe.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796b6b5311---xekajisiroj.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197999b918---wumasumotusorabetezega.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e472db73a4---judefukizamefobusijaba.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fadfcdf6c---gidimoxuzi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081906a6b2d5---809654719.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ab.bin
e43c585e7e9a319fa7e9c455fbb73846e5c55321f2f75d53dd0ae89dbb357f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 4968 bytes
font_01_sfnt_off000104aa.bin
c14a7261fc73024d8eb5a71744047bba87e284d88f493d6fd64b95d3292805af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 2448 bytes

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