Malicious PDF — malware analysis report

Static analysis result for SHA-256 373b8c649c01e872…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4825cfb761db30dbdcf0fe191e33bb3 SHA-1: 9cdb8f48fea8408b4502f1511c9f3fa82a473276 SHA-256: 373b8c649c01e8723b789583310418087211eea38c014e724fa34e7658d488f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious content. The presence of embedded URLs and the 'QR code redirect lure' heuristic indicate a phishing or redirection strategy, likely aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/95po6t29p62nvc7nedhveo13cc/sirefanigizalivobub.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/kononefegodexudukeparetop.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/devus.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92457248374.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tupajitobegap.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/98269628230.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/rewemorozukegatule.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05fe6240e428e7708e241f3b2aa5c71d/16263219842.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p8ujagcvna14luqnjcnr2jndv5/pikakivuwuzopikibesizefun.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612beabb97ade---fowesar.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-7/20210807234332279218.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a2232bd69b9db1bc8e1fdc594c699583/rogapimuduxopule.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/pogezomigujebevewuxi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/vifaremoji.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd1971d49---jukuro.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/95016031309.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/202055e5cfb8bc689f11b00900a79588/babalimutul.pdfIn PDF document text
    • https://digireg.it/upload/2354525609.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e866c882---vutitiwulopa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e8fb13a6f---gurikemivuzaxudu.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/tinewaloruzobivo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/25f63203ef781370978355867d76a1a6/vejabisabopaj.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7b330c96---bajivagubiratop.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/38809184486.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ccb4bec23---lonobanowimageri.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/luvumakafuvudobav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ford+fiesta+2012+workshop+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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 17484 bytes
SHA-256: f67f72a001ab4e2821dbb201b9708fe6321f015d2bf1e50269835c4d15615811
font_01_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 11312 bytes
SHA-256: 167e955347f36d8d109fa205e098f0a19aa6ae439c6b2f0de6c5bf843b57ede7

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