Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad83d15b229cd6ac…

MALICIOUS

PDF

99.4 KB Created: 2021-07-26 15:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 170d864a71c8c9a122f77a5b39e9c0c0 SHA-1: bf5c55c7b2c726e12591815e7ae1533d4e897804 SHA-256: ad83d15b229cd6ac2ecf9f09ea6168a080ee5ee54b25e2274d3e729c26bcd8a9
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery vehicle. The presence of a link farm pointing to compromised WordPress uploads and the 'Password-protected archive handoff' heuristic suggest the document is designed to trick users into downloading an encrypted payload. No scripts were extracted, but the PDF structure itself is exploited.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082660e9d5cf---tekarimewuxan.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/zokepulape.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4iriihhfagk2m6cid5qtp6ir00/nefuko.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qkg4g7ogbubkb92cf89kon6s9j/zejisivadofekeledafe.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/98159938744.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/18f4d22f84cf4aaf688b598ac68cc285/xadazuvirinotajesar.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/46n3n3qdmd763065nap9tmbl36/12254723314.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d82e909a5---xaxekevowub.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/woxelaxirevew.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f39cc433---tefoxivolulezo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2106a9ef2f8859bbbba83edbef5e6e5c/34302565815.pdfIn PDF document text
    • http://armanetti.com/images/vuzudo.pdfIn PDF document text
    • https://tavio.ru/files/file/77816426611.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2e47d46140289fdffa2aa7f448588645/10172872486.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/97969554791.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/97968623908.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tajagirojib.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b3615208ebf---wosaburirukopuwad.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751ab1e6446---4345227078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=planeacion+de+historia+secundaria+segundo+gradoPDF 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_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 18392 bytes
SHA-256: 03b2356c8661db9fb43eb80ef4d3ac3e25790784e2784c85801286d397315ca9
font_01_sfnt_off00014cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DC 10748 bytes
SHA-256: 1658b445faef1a8747b16651d7eeb0930e5e957c19651a0444cb9073b7b172c1

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