Malicious PDF — malware analysis report

Static analysis result for SHA-256 f032815a7073fcfb…

MALICIOUS

PDF

84.2 KB Created: 2021-06-10 20:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 696090e13785c73cc3a0a3f031a91622 SHA-1: db2f31cb0536c87e728cc76ec49b81fdf63f5f46 SHA-256: f032815a7073fcfbd2ec897ecb85d664afeb8d6315825f84f6119d44383ece65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, likely a phishing lure disguised as educational material. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=10th+class+maths+textbook+english+medium+pdf PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c3213f3---fejil.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a61e935fa---37110839275.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/bisuvumenozadofenoronag.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/nexawapofonopapudugerejob.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16096272a02d90---57306347012.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16883f4fb---joxinozivudedimabaxi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kuvezin.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/getiteva.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/zomosolowidutemiwaguwofo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d56da862---lepivivivo.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/19863912866.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/lobazatasufumuwameke.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81844350495.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc891b448e---vusinenopagiwiwewasigin.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o56f0b763pj8525pl16odpsjb1/tubataretomesofofaw.pdfIn PDF document text
    • http://renovator.cz/files/file/fomalikaxoxedebun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5724 bytes
SHA-256: 3f9a77668ce0e5177814b64e6f7fb96d0b67ae65d81684af7284e6f5195af638
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 13244 bytes
SHA-256: 1ea44be71ccc1f58884695ad02258cf8008def0ba08d83cace654eab34fe62ef
font_02_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_03_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 7064 bytes
SHA-256: 7d4c2037a101198c02cae7bb3a27df2efa042072c5610398779505eb04652449