Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a324c4bddfca624…

MALICIOUS

PDF

98.5 KB Created: 2021-07-23 07:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d4a4838736fed75c1501202aaba0ccc SHA-1: 8983393506d5e2dd5ba444876bf85a993b9981b0 SHA-256: 2a324c4bddfca624815da730afe8dbf728d5fefb13ab377455839f46d823525a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

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 http://aceonlinementors.com/userfiles/file/3568311023.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160732aba34684---xenuzesokomipejom.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/88099852349.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54a15fd55---1106210861.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/rowupedobusijegumusiloka.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4732af28830d9adc150977ca8f40d61c/danenuwokal.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jinaxuse.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/11434834321.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/nuxatesozugupovaloxukurit.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bakim.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p2lveqja3v5mb2emqee7fmts3/85223413239.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/xelatopovab.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/28304716490.pdfIn PDF document text
    • http://armanetti.com/images/kavusipenedagutiweredizuw.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/82422431465.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33c35b82ee4cc9d63d62a07646b8ad79/68196557278.pdfIn PDF document text
    • https://btegypt.com/file/nutogibesufa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73957123525.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec92e5fdc---xebisimagesofa.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sefathgn9vhuu00h1672dqd1n5/81156186206.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078e027ba20e---vuxalugusanivaveros.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503161259385520.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc343ad472---wajonosaxuvudokosidomagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=westinghouse+co9+relay+manualPDF 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_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 11052 bytes
SHA-256: 4bb4439b76b1f289fa03fd7492a102ca9738af3bfb00adae26df1e5c5c456b7d
font_01_sfnt_off0001369a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369A 16496 bytes
SHA-256: f5654610aa121fb94b7a79d632dc840c099a68a74ec15c29c67ce05e208fd25e
font_02_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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