Malicious PDF — malware analysis report

Static analysis result for SHA-256 1987b8107b2b067f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 02:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bd5a3b711a06b7f0491fe1af652caa5 SHA-1: 4d786290e71ca462e3579ad9327ec2afaab9ed3c SHA-256: 1987b8107b2b067f6ca6a0f9750a4b3cf78ef8f1157cee1bbefb4d5af8aac09c
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 high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic to disguise the true destination. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fe7452b0726684e79516ac43b6c0e82f/xenopimesipavobozu.pdf In PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/57509795319.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/toragajeme.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tesaxivumamudafedipesod.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/12777933068.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/82383715275.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/dizawug.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/28289578620.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r9oas913ho5esgg9fcm6le1m4p/depozomir.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c21645a7---juwudasunen.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fidojoxujuteximimomojajav.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae19cd2b5---nivikozurolosowibom.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279bcf28d3---14108328332.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wibomukaj.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76ce8afda964414212df0ab40e595085/boxebezenilo.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079769be0521---52899805034.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609df02dc2fd3---13515118574.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/434da9916730d4ba84701808861e55ad/doloropizegokorimibutivaz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27cfa27842---55968136385.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/mebogaxeluxerili.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/sawuxegofolubozipepipura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1967+mustang+repair+manual+pdfPDF 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_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 11164 bytes
SHA-256: 9148c84dcae169bce41cb69b5feafdb85df05047476f51bf666614182a6b9469
font_02_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 17860 bytes
SHA-256: 56ebd5f2a22720b462bb2b81f871b0de6d3862b0ddfc82f91146935c80149533

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