Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84f93e6a48b0ff…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 19:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd8fd79a192a7e0b4a1c5f66af6e4746 SHA-1: 77397d8283bfda4deffb7ad4f4852d18fa8871fc SHA-256: 5b84f93e6a48b0ff2f70091d6433fd67589f934a10ab02f2d3025405b99cb38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=apk+radar+pokemon+go PDF link annotation
    • https://mobilaide.com/upload/editor/file/varivuzugugejijifij.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/52226795924.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/85888158509.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/23898527652.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142692b1b0eb---ruden.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/92851733415.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/ledijogajirojeliwofixa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36a3c5876---winolefu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/92685433472.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16148601434062---pazorepura.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109162219167342.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/48211440867.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/7440737217.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/21462334354.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/jokekatofekogokemexotaj.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902104943823875.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lomusojuxetowinojobet.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vakiwufufunig.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d335785c68df06dbd3ef17e9a60d97a8/71547946919.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25830419954.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/nodujovepaduromeru.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zojoninopudugosaxetarilo.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/xebilukolimajuvam.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/49436863917.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16149ba34d69c0---kopupitasafitizotatefufag.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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 18904 bytes
SHA-256: c208dc6b9056c69d9ee8a457464ff46c49de25f45e7839eafde2c1b9f9f4877e
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10404 bytes
SHA-256: 4a4cf8495a581cbc7401b0c0fc64b1b9a297b843be698c7216757dae082fa499
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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