Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed932a5880c6e08…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b712f6e6c7bbcdbb411da0aefd0d8434 SHA-1: 94ccca18a96d649f9d6e11551fc2a67433c55d10 SHA-256: 0ed932a5880c6e0889ec77ddec178fd7a7c6e95d4e960ea9f833406c5e68e61f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fed1e2323---52099713956.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1a88e8ea90110e642618ca175bc0fd34/bikisepibopoped.pdfIn PDF document text
    • http://lobi.md/userfiles/file/76040209424.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/56398985017.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/ruzuxitadat.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/864e8f83c64ef783aa8dbb228a9b9e3b/61493384767.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/187e0fe208d40254ace4968f63ffc5b1/kibemonunu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/223e2bcfur8d3annh2r58kbnh2/jiturizuxosulo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c50b0b7b2---62557200803.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/20634297797.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/85980169971.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/30497013906.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zosir.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/mosixejuve.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/73451475302.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/5841581631.pdfIn PDF document text
    • http://aa-nusd.jp/webaguz.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ajhlefbprpkrb700lg4l9039u2/wowawevagatarubudufiw.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/nudata.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/42329796667.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/35573984418.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nibafabow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=commercial+arbitration+act+2011+vic+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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 11144 bytes
SHA-256: b3ba8e89b0051f37ec6b0da9a54d68fae840718392c2b80983d137dc883d0588
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 17680 bytes
SHA-256: f797a080f5c3238a0ed565ee21a499922fa6011dd3b6e0fd64a9150319d0a9e1

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