Malicious PDF — malware analysis report

Static analysis result for SHA-256 d141650d458d5701…

MALICIOUS

PDF

91.8 KB Created: 2021-07-08 11:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1203e7738a32226ebed4e83ed9ef043e SHA-1: 0e5ebcdfafec4e8ae1a5722e4fbfe68481efe799 SHA-256: d141650d458d570197d32d37ce5dfaba7538212865699b5b346d0f308a3962d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tuzvedo.hu/elemek/file/53970422445.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9cebcc01d46117b1b01205f58a594b25/93453755273.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/50860514650.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5hq4hav919jd8lju8hemcovah1/butadewobotatural.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/30dad2cf52a2b27e19a903f5f5a18fca/pamabidodiboxodim.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/43115009750.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kewubetexuwij.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92bc65ccc0---fegemimerakoxer.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a642014a920---39647856894.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/jufokazivutevagonuxizuke.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zifasamomuxilutereleleda.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f267e3bc3---kafatuwamoxefevewejazufa.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/90668248474.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/sarivabasufuvoj.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53c4c6d46---53100097149.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/77949843072.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210702_F3B9D72E60BBB528.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4d47ad378e3bf01939323c1e50907e/79864279645.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/lelolukinu.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/34336575711.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/88669509200.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/93337561532.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74694481000.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d7dcd55a---84565112113.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/46118617523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=special+purpose+map+meaningPDF 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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 16772 bytes
SHA-256: b7e761b819c419733f3476334255275dc65db8bc7a52eda97d9e543d2b1e9449
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10796 bytes
SHA-256: 394bb26b63cdc3b17e1efc148e3c180357636b0be6a6a34e4eb8af7a36da0713
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 16400 bytes
SHA-256: e7a37577ba2a30d0a21bb681a7b7576409f500daf7f552f2d697e0621792291c
font_03_sfnt_off000147e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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