Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8e57eeef6114dc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 09:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e07df666140b8f1cc2df84dfa1825cfb SHA-1: 8195719cf6f3f72b0943b0956157b31dca6057db SHA-256: fb8e57eeef6114dc736bf2bf42ef519f7274dc8dfed66759cc19f3bf51ae9c7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage 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 0.9981

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 https://crysiq.ru/uplcv?utm_term=photo+to+text+apk PDF link annotation
    • http://africanhairbraidingsalon.com/userfiles/file/66957679343.pdfIn PDF document text
    • https://goodline.by/userfiles/file/rerotarowivavomamaf.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46131681353.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/95101547663.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/ginifaxitusur.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/ruvitalimazukew.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905073430.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d9d92f1e864f2e8ff000e5446eeacf60/68003091123.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/10113139413.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15b7e09b---zegudukatobusuk.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8d602b81f54a6cc1b4e16517be8a6b72/6674282719.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/51362543244.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/35776836306.pdfIn PDF document text
    • http://cocoal.com/uploads/file/87894174715.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/romamiletidale.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/640a7c472d7c597af30ea1720cc9d929/21060024297.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a4126ceb---11904224480.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/69880046883.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/32765117495.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/24031215768.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/zofikeniwel.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/16110200234.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17036 bytes
SHA-256: 9ccd90b08cf9ed3b4db3f1ff0ff64670b5866fa4bc01231d81cb59a976d617cc
font_02_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 10032 bytes
SHA-256: 05f52076223a2e5a8c41de52f045e250e66051b4babf888cc7c21e52d3549cb2