Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f8a3fdd282b71a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-25 06:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d534e256d81c513692c412abec61ad6 SHA-1: f7f1d288a4250bf3ff584cdabacd494038b1aaca SHA-256: 59f8a3fdd282b71a002f67b403bd80bb2c79689470cf34c7af4169d1889cf8a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. This indicates a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9a9ff4778fb763a911fadd2a86960c9/53543968640.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2e9903c8f3c5c0a06e417ab9edd895bc/raniralipopoburanemoxuz.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdee3d869---56029407065.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddd2780f6a---92484978914.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/95363205037.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/renepusukexunofan.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/61037319290.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc724f347a9---45828963751.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6c8463dd4b0e14302d1fb882bec5a71e/gijorefejogejas.pdfIn PDF document text
    • https://ultralloy.net/upload/files/6512521842.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/fodinalevuz.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/wanovabekugifixasotupa.pdfIn PDF document text
    • https://orangerun.re/photo/files/boxezigaleg.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d5d25344b94a65e1c1f3b9f36c6d2ae8/rofexusubabafuruni.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bijovadesobo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a080a333d---80618160577.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099650825674---sosuvejonev.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/13680616193.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16116ede2b3716---81918594693.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bugosuse.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea39ecdc48---wirewusuzalax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+purpose+of+writing+dialogue+journalsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 17252 bytes
SHA-256: 41ae6b732f3bb6902ade3d7dbeaf4d7c72e0278ac8d9f2867e22a506a4d466b4
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 11088 bytes
SHA-256: 09a61d25f78bb389b173333c7e1d7ebd596628529f02e23da960a70d3fd55bec
font_03_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 18368 bytes
SHA-256: b3d1b0ad0a247d3b541ce9eb6210ce8ebdad7e6559697f091e69e255cf6fb52e

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