Malicious PDF — malware analysis report

Static analysis result for SHA-256 957140b4a933f098…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 22:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c8e98c1a6e057b64e675472b03775c0 SHA-1: e9c23dbba6f4dc8bc41167b9b6984b064711725a SHA-256: 957140b4a933f0986a078b68cb938f19a8944658d919005b12498c5a99b61137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The presence of numerous URLs, many pointing to PDF files hosted on potentially disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hasyo.net/files/file/89114242490.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607920037760c---mafopu.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fb1b899a---37149179604.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab25ce79de---niwolafaribe.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/45463578929.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/df6gv0hqg3udn05e462v5anon5/vofon.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b1597a53---33032032066.pdf
    • http://www.aluvascientific.com/UserFiles/file/moponewepujotidobefotawoz.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/56367366612.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/079933ff72e2ddf71090b1f5c77ef8e4/sivogumebijo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a143ceaaf04---77300627872.pdf
    • http://enotecagaribaldi.it/userfiles/files/2197375117.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pawaretuwaranexezereg.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e6e3ce7e---vofij.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/40100681987.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea080f112---85162138947.pdf
    • https://iqmuseum.mn/uploads/files/jixoruxerobibikuwogiwu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0kuloftfhbbmtvn53mui672090/judirosoni.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/96e634860803a2d19e63f588e22dc72b/newatifovimovesopil.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fowur.pdf
    • https://kovtec.pl/eurostyl/photos/file/74333878389.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d3c27a1b---jijaramiribetowokotemura.pdf
    • http://euroinstytut.pl/galeria/file/lefixibaxigagivom.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3b9d62f---repoxobejimokaxozotujos.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/77914275667.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=agility+software+development
    • 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_off0000f19f.bin
fbdc40f1e2c25b0bc2b8fb74c4520888bfb14bb5403e0ac801e44b50dcd4c340
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 11088 bytes
font_01_sfnt_off00010b56.bin
50bd11ce7c3cdcfdffca08cc3d5cd4f06c6315ec716c838cb6f54a571adfb1c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 17748 bytes
font_02_sfnt_off00013a3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 16792 bytes