Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21adc7f50a9042…

MALICIOUS

PDF

74.3 KB Created: 2021-10-11 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8f2636e9ede63ac7fad1cf8fdf51822 SHA-1: e27727794da6fd826c885e31e0647fe3674572b2 SHA-256: 9a21adc7f50a904273d0d4df7a6d588ec2458a96490d5c571fed64594c00b184
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a1-automotivegroup.com/upload/files/55075355490.pdf In PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/gufufenosumidawuxemu.pdfIn PDF document text
    • https://novitas.ro/files/fipikuwotiforeturasiz.pdfIn PDF document text
    • https://majubesar.org/contents/files/88786796501.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b938a4ee37---61578943578.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210924210512.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8db140cf4---xisotofogipowererajeri.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/4335058965.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3412aa064d5e65980e2ff3306c67fc1f/67236016757.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/pipomodubizilo.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/dufedu.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/90738961626.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20485804018.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/keretajemum.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161307996e1356---sukibojok.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/noxurumijigefivupezebono.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/66650915845.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jifotutidebes.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fawatiwofofo.pdfIn PDF document text
    • https://foulardfotografando.it/file/45872354562.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d2b85595---kurunakoxerax.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1124e9393d12fc6cc90ae84ef189f2c/43539097872.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=red+touches+black+red+touches+yellowPDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16808 bytes
SHA-256: f6e3f48799af494d01b3c5d52e21c0d7cdd6f3b9c95f3451785ae82ec6cbde40
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10848 bytes
SHA-256: 6074920b74c7ba8e6a42256f922fb00d0652b6afa2dadac15f22d7d4d2b93cd5
font_02_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.