Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a15b01298c22e85…

MALICIOUS

PDF

81.3 KB Created: 2021-08-31 23:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efdae266d1e791711a3cffdcaa576af8 SHA-1: e2b410f48b371b219db00140c23b1d2c9b7d0206 SHA-256: 0a15b01298c22e85eec2df56aee19a243b660a6d0e3e5a744d0beab3d2275ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd711ea489---bixitafumi.pdf In PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3fbca96d6e5dc96c08b967e3aa717572/xawonigowut.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074399a33820---88233415449.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/69781546392.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/29507374840.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/21342135401.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/15681747693.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/8140285166.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e3bd0cb784dce8366120905a850bb688/50528385769.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/99406291284.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da2698524fc---zeminogixo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/bojugese.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zuxolikatup.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/35008530005.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/91878605909.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5i24qiigc81rnmv1m7ql43ss6a/73447048307.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14163aab4---lonagevaganulit.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/62979756352.pdfIn PDF document text
    • http://fullx.net/files/2768002987.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/givij.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9a0f16098fb08a497c38132d3d59f1b2/mafarageminudalumuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=palpitations+for+a+weekPDF 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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 16776 bytes
SHA-256: b688b025653031ec0e68218c1f58c2a758df34f431418ece7d79a006f387a542
font_02_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 10532 bytes
SHA-256: acbf39f08b747988cd6c20ec6aeaeb56bde34d1c44f66a8299c20c4b9cc3cf1f

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