Malicious PDF — malware analysis report

Static analysis result for SHA-256 782932328141d794…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 02:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e7a59e367166fc6523820f3fec011fe SHA-1: e914b40d4d3bb2cd34f6b71b3c233a7dc1486b44 SHA-256: 782932328141d7948434d3dd590b20616bfe9b647956f01622aff817a5c6847e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the true destination or for SEO poisoning. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://recko.ru/ckfinder/userfiles/files/putoja.pdf In PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109020328447544.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e219e879b---tibisokalexutuxisuzoluz.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/votajefosokafajinuwaridu.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/89963412544.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/72231319290.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/wolimivafazek.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/ribegebubadotujuzor.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/19676904632.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2b29275f4452cc142fa1c13c771027/kivatefesog.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/6363687887.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/88700778324.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/35647081939.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/50570619984.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/69533295860.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676a8e82e0---fisuwelujijobater.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/xukabetomuboki.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/fakaxenerorivemawurawo.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/87475965357.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/72048537431.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/87598441696.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/22511721629.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/89729474621.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/lelow.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359f4d96bc7---xizogupuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+app+switcherPDF 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_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 16308 bytes
SHA-256: 034d35e1dffaba06aaa69050402b16a9debe510613c201410236e0b47e9ffb93
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10696 bytes
SHA-256: 4a7dedfb6f76187508c281be0557d5327cc004a8e9abb64227921dec3bf74b2f
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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