Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c63f2faee2b5103…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 20:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85206785fda81635560ae2d878e7fd75 SHA-1: 2d3e7c1694f6c4aa39f4e0d7529d617437657845 SHA-256: 2c63f2faee2b51036a3ed49ebc6b16be8fb88e7d57d2ad2f4df6ed05356a78a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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 https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/83485809902.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ebcad7a9deb0f3835f16b7683f452ec5/bezudadaworalosa.pdfIn PDF document text
    • http://artospace.com/pics/file/5066897122.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/zegewebujefenonurunij.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c484ee3e28b0b054f9bb6b8af3fe30de/80163169496.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/26206123551.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901003246.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hd16bk6nuru4g60ee6e9efpjkk/botojokupewu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vamodorefetiwotivojuza.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/52adf0c7136e5b63d183e9f7e42c6629/gajawavaxurefije.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kekibagup.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/pamufojadufakanazuduna.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pevuzabutifevubuno.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/faralijilasasusikum.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f7153da6---dubinijed.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ed4183ad---70503469492.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/10758760087.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tm71d28fl3nik88pbc85ldbv33/ropemelunaworur.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f5e5c90b0ebd304005e35263a23b6253/83648804735.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/5784800444.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/dumijotutuxutugoxozumuwuz.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/54366833574.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/ruvojarekakarofe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b1bb43454c89e50286a1649728aefdd/29799380400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tinea+corporis+pediatria+pdfPDF 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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 10528 bytes
SHA-256: 32d1267c26c34f7815a549f2937287571a6cd5a370cd16f9f2f136cfe473c66c
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 17948 bytes
SHA-256: d59ddfb20c0120ec7563a7b2d7f4aaabc88dfa4a1385ffdb542916171ecf3576

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