Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2bffd1e31bb165…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 00:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 117ed405b83e2ed951e952b6846280c1 SHA-1: 854ab0650eccf648a5eed78ab7c03d41e0b035a2 SHA-256: 7f2bffd1e31bb165616bab45c361c97088f9e6675a63247df79c52634c5a493b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content. The presence of external URIs and the nature of the detected heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399b746078e---89510680607.pdf In PDF document text
    • https://hunglivet.com/uploads/files/202109081626509025.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613680012479a---zadomujupakemigake.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/4079993790.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/82669603126.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f154203ae6---besafebezujujefidituriro.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/duvavulefokeg.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/sojetufojomedukamanowetop.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/rikogilumaloza.pdfIn PDF document text
    • http://nensi.si/upload/file/bizexiwavavoboti.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/22047959175.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/48fdc7ce4184abdffe349056af4b6dbe/posotejonorijelovukulanom.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nibirorigosomizadadagilev.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/70942154932.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lomutisikewane.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/dulomafudodus.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/79867717351.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c18ca6acd4a547a273af9e8adad5413/99214289020.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2096c73e7---30692888765.pdfIn PDF document text
    • http://qwerty.pl/_data/file/dupalivitogale.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386c5b714ae---sebufisam.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/11097413295.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c9f9ede3---44767076721.pdfIn PDF document text
    • http://hocomesun.com/upload/wozususokeloribor.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/91428907668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+put+a+song+as+notification+on+androidPDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 18224 bytes
SHA-256: 6efabbe472ca2f811d66eb3f17ddc61f8f232d182f90fea1a5d9e6ed7aae4601
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 10792 bytes
SHA-256: 7badd41b0f4b174d8756ccd98f25c9d036ff53274db6a359c41cd3b6df42ec6e

Open this report in the interactive analyzer, or submit your own file for analysis.