Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07ff71d7e05bd86…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 11:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 820fe7880f93f5c9789c7791971e375f SHA-1: 0c031094638f6ff8320cbb4ef82494ab1065122d SHA-256: e07ff71d7e05bd86e7306f30e7df595715923f9febbd5f0eae1bdce5e4c902fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://zae.me/datafiles/file/94302858195.pdf In PDF document text
    • http://anapro.com/ckfinder/userfiles/files/50933464128.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/42b0bc968a0880455279d436f1b7589a/64274113628.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/pexodupamafim.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/rikufi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c320f9130e0ead30fce072c94a67c4a7/fujijezirumegosisonufun.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608798d2224e1---busorezefabizafuwokun.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fd164a2b745334e1701e53486ab8ed2d/3755566709.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/84453957413.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b891afb72---nuxoropumi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/3473559971.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ldicq6puvpui9dkaon4o0sbksb/45155485678.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3726ebcb09---kosabodedujomi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jrn6h4vivukajfnvohec2vspa0/duxogorobakizujugep.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/44772923437.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429084906230508.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zonutalulubad.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210621153254.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec3a58048e6b419a6d8252863967ded4/78359050584.pdfIn PDF document text
    • http://leguido.net/files/risidipokaladilukulavere.pdfIn PDF document text
    • https://mmszke.hu/files/file/wuvikamewevisizu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/73842687097.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/24027105e6c9a7bc69ec44c4d7e3b93d/bojifebiwisaxaramobaxa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5e9c0f20ed248fc6a2c79b04e48ecebf/98283781603.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/filuzipojuw.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/84241848867.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838094b9bd9---21112393438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bacon+and+scallop+pastaPDF 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16816 bytes
SHA-256: 02167e67a67933a942f1fc505fcb9f3bc046a04ca4a3359a6be5c815214a6c57
font_02_sfnt_off00013495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13495 10236 bytes
SHA-256: 14a2ce5f7fcc28e1306050978c659d2e17a2acda6b860347eb14e1c80a25ed0b