Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc3558aa97a96c8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 06:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc20d07407e46325bdded83a8c991c4f SHA-1: 4a1fe9107d4f550ae14d2bace551c59747ca5109 SHA-256: 7fc3558aa97a96c812f7822532f79cc50fdf6c605966418109efba5f0e920a0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports its use as a delivery mechanism for malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=metered+wifi+android PDF link annotation
    • http://rzn-house.ru/upload/file/19309878913.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/41774642497.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xokedekefepupideduvet.pdfIn PDF document text
    • https://everestart.com/images/stories/file/63497874682.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/saxopepaj.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/35341854001.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d159094e---gepozidipupibulobome.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/nubozirokuxisogubek.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///kifogejomujulabatuboni.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/46192151818.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/64479974995.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/48537317659.pdfIn PDF document text
    • http://lejuriste.ru/files/file/4187255128.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4dcc6d72---48149076033.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/76819428505.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/76596931836.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6781191957.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/21226031059.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/biwomeleguziwegipelofi.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/72053280433.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/25722300578.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/titigexagalimelitapagosor.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27c6e3f2e---sinivon.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/gekulirakewubaxudi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb4cb3ff8---fepuzopen.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/37212208036.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613dac40d2aa8.pdfIn 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://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_off0000b8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 10212 bytes
SHA-256: 5a0bdd39a8d749e8c0a3e7114ab69a21dd40370c7c819db91dfd487b98ac7614
font_02_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 15328 bytes
SHA-256: 6c8be24db9e509484e23bf1e0285e2e1fca60a9c4bb95f9481e86ab093b6e3cd

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