Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c9bfa71a005bba…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 15:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd614a510ae2076884460042f0d0cb92 SHA-1: fdf0cc9e537961aa9db34259d9ec5b1d53d8da6b SHA-256: e9c9bfa71a005bbadc08c807a0af5c5a06189cf605cf3d9395c9ef5eb8d27844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://peoplefineart.com/assets/202108/files/20210806220514937304.pdf
    • http://logistra.fr/ressource/site-image/files/fajopenivesupikominurudi.pdf
    • http://iwayman.com/uploadfiles/file/210825222424282623ffnkau.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcf2a9bdb4---vavejojediropavugej.pdf
    • https://retake.dk/ckfinder/userfiles/files/merinabuleluzere.pdf
    • http://ecogestval.com/userfiles/file/tuvego.pdf
    • http://onsijsselstein.nl/userfiles/files/17063622533.pdf
    • http://barcabianca.eu/upload/file/25657896989.pdf
    • https://ruiguoex.com/upfile/files/2021/06/11/92431947636.pdf
    • https://radmangroup-ye.com/rgfiles/file/wibig.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n807aqlrkrbm6ikk0jho60c777/962334429.pdf
    • http://casadiriposomarsala.it/userfiles/files/sanukuwiputalenew.pdf
    • https://hpsoft.shop/upload/files/5544302684.pdf
    • https://laetitiabernard.fr/images/file/rosagesuwolefumo.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/809d05d2535546e2aadf514028c2cfeb/kivaxat.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/42dbdc534d76f231677d114cec2ccbc0/fasudexadukezunebajumapog.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4d1a6c751848190b291d7d1f784cca0f/26968887446.pdf
    • http://vietnamairlinescorp.org/js/ckfinder/userfiles/files/bimegadufisajizotevo.pdf
    • http://quatanggiabao.com/images/uploads/files/tiwuwuvuvoxinodava.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e04188c7e160813e2eb44b07e795c34c/20795800138.pdf
    • http://parcroyale.hk/userfiles/sutakifasabewufozomilir.pdf
    • http://www.tokyomagic.jp/images/library/File/fakudegi.pdf
    • https://avgdesign.com/userfiles/file/37957364230.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apa+style+apa+question+and+answer+format
    • 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_off0000d693.bin
78dd2a011e9f70a17b810ecfbd668a0b5dc630b15b81a5072c5f522e7e6db52c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 11088 bytes
font_01_sfnt_off0000f054.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 16792 bytes
font_02_sfnt_off00010866.bin
3e1fbe4db4c57be5d3a144b2416758cdf1914327f1d99ca8df31b64dd2ec7161
pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 17732 bytes