Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aad11786608051c…

MALICIOUS

PDF

71.5 KB Created: 2021-07-02 05:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67e1cc6eb21176eb8869552d1f0f0acc SHA-1: 4254f3283e9f9be83d48eb52236d945ef1228141 SHA-256: 6aad11786608051c13a3424ba1018cb9a44065137e972e5cf1ca302880b03d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for phishing or distributing malware. Heuristics indicate these links are intended to obscure the true destination. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it is designed to exploit users by directing them to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.abcklima.hu//data/editorfile/vutiwidiwogisajifuvenigon.pdf In PDF document text
    • http://beerskiboot.com/img/upload/file/wosazegiz.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/xeruzijufikoxafiberefulu.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/babumemulotabe.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/8685633148.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ae08bd00---gekumetubuwenego.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/nekipa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5719da9fb---72741893098.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/gipinarij.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/povajetuzepan.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/libefunuzetefafazozadave.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4333d7ad95---beduxadakomejigifibulel.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vkv1vtg6sprtmn5102qrq5tovq/refagoxelije.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/58ml5k9ek95dkaq7dulkl2egp6/93192167042.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd0b5be22---81373450669.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63728930389.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/75050359559.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/sasufit.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5391a7a4715bc12f8fea289d5f77c791/73284596492.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba33214c10---gumasidagupagodutoxiwuzu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093226b7e5b8---soxevezemejujenori.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/04mth4463ds0dagcdfdh67po70/95190158896.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/o0veiprv228136j65nthc2to0u/rejopabibim.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/samitapekefoxefonadavekuf.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/29827054926.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/bevanugotuxidiluz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7a64149fc80e79a6e0215f0e7c163ed7/pibolirarajovumubaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=granny+titty+picturesPDF 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_off0000bad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 14920 bytes
SHA-256: 5e6d148403a33a4c3a672d84821d20022304c724f8b826aa28fded36dae3466d
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10456 bytes
SHA-256: 8087ed6905bba22e7c22cfbaf25c326d5130512ab4a97cbf42eb984736664c79