Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f21418293e4aae9…

MALICIOUS

PDF

220.7 KB Created: 2021-07-07 21:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8418d52a9fa6837fe4863cd484670ec7 SHA-1: d7c86715853c9832051bba038106db2de00c16b7 SHA-256: 1f21418293e4aae9a5294f0cd06d598860866bf28e2c19f5df654ee94788b927
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and ML classifiers. It contains numerous embedded URLs, with a notable heuristic indicating links to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 5

  • 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.
  • 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://iwnta.com/userfiles/file/wukofamazagaza.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/53671111727.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/75685031490.pdfIn PDF document text
    • http://sparkpro.lv/content/file/38627556880.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbab23e87---56387418116.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/efe55203f46ae7979bec738d6d580c5c/gekutax.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/49107082719.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb802bb04e9---92620031814.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lutuwajazobusat.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sjved0u8qgdj6pksmeoq1qidav/91924576826.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6a21ac20b6a0d0d069736fc27ec4362b/somexatulikupe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69271520b---menusan.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfiiol8q5rcelb6o2e08n9iee1/62016908622.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/tanokozigufonudomawege.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/46074491832.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/df1bb4934be9995f90c7e7c09767916a/99793655156.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ce627888---35307913510.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c003aca73a793ed5c873dcc4e75d67d1/96822176080.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vijularager.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8gcv28h20vtbpa7dnti3g1b7q2/22468130284.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e1767f4d2d9c6b6fb2fa489282047424/83960075540.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/20222169791.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/svgrtsrit93do2j73775a55vq4/26651624283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=advanced+introduction+to+private+international+law+and+procedurePDF 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_off00030440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00031c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C57 10572 bytes
SHA-256: 1e9da96e72b84decf4e8c220a48125c224a60f8645cfe866188849b2fb95f0ba
font_02_sfnt_off000334a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x334A4 17812 bytes
SHA-256: f08cd2102c6ec743fdcfbb1a07539458373900893576d995a9cd3399eaa1cd3c