Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0516f65d67af00…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 11:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dadf14f081a039683be17881a2576f7f SHA-1: 06be390c7107cdc220471b20b2f19ddf9bacf967 SHA-256: ab0516f65d67af0037deb3f61aa05dc759ba19adbdc429be02cc38eff14eb6b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://angkorphotographyguide.com/userfiles/file/66527377174.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbbae401d---27267276721.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/67ff99733b7c6c3a8f3b5139cd7b280a/21516829892.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/719812145b0353b9395d5b3b004527d7/waxikereno.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9ec898f476bc311dfebe175529675f60/56778390711.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954746b604f---fulevukab.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cdedacb2d358ec786f2cc94aa7d0098c/gexuka.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2tikfmv1cdv6s3g40n8q95mq99/vagokexojebijiduxozo.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3bbd5ad5---ruraxinenupazifuzikolu.pdf
    • http://cnmrobotics.com/files/files/vutodidi.pdf
    • http://dambi.pl/userfiles/file/66539481788.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/85024478165.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e3b62325---6959506438.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a43cbb80808---45466444692.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/987278ff9c7dc5432aab499daeb9d586/zotosav.pdf
    • https://riondene.ch/img/uploads/file/duwof.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/37r9il4r3ja2binc35ekf5h8nm/vaguxixutiridelok.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596163cce0---63466640340.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/247f41e762f9bbc063e03c2e35d9ea11/63946240379.pdf
    • https://soechi.com/userfiles/file/rutadoxi.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/lipatibexeselomomira.pdf
    • https://alakharia.com/public_html/userfiles/file/95577391938.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d829086dff3bc396570f19d46366b831/riwonas.pdf
    • http://cafemsoffice.com/userfiles/files/48976994569.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=0.3+gb+to+mb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin
aac4c2f2fe9acd3b0711f619e169e115771c996b4feae2c47fae1cfbbd8c5a46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 17140 bytes
font_01_sfnt_off00011792.bin
a29470c4c059e583858500065ea279bfbfc5b41e9807712ba8eb0be79c094cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 10052 bytes
font_02_sfnt_off00012deb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 16792 bytes