Malicious PDF — malware analysis report

Static analysis result for SHA-256 137ff073614e0c2c…

MALICIOUS

PDF

122.6 KB Created: 2021-06-28 23:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c5a8908b539ff8cf7e6b927b65c8b5c SHA-1: c306d161e2c8139c92c0f88f2964a52b5814b04b SHA-256: 137ff073614e0c2cf2b2023eeaabcc1a43d6ffe21e60491f1a80bda5cf5f80e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://doellefjelde-mussemarked.dk/images/newsmail/file/77848086804.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/jelukanelap.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eeacf21013e4d47b28448ce5214f0d73/fusizovuvavoxemusozeja.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/19182466430.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zipupopekesedogitav.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/k1m4akmsicdvbk484pmit70n27/vazenejesok.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9ebd1894---bonazewujowulofamokos.pdfIn PDF document text
    • http://vejwun.cz/images/toxovu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073db4771bca---98926691844.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7903395669---bogubopunumawowonolefo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607056c7356ee---luzexosemujusenazizuw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4076625b64---74390291723.pdfIn PDF document text
    • http://navigator-33.ru/media/file/rotofarugivipomirojofa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783024cf7eb---lunobozanuxizir.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/97970864489.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2bcd829a---63115923046.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/giragapiwawizefurizisujal.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e0af95fe8aeb29b9391eb1abe89e6c4e/kefutufape.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d7c362121d0a1153b9f47f3a4dfe4ca1/gebuzubuzirekixebesazo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607220aa647e5---81974433655.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//83195755939.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/89a7f081af319c9d951fcbf90d4e50f8/bametivumaxuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=closed+coil+golfPDF 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_off00017d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001953e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953E 10220 bytes
SHA-256: 3d3ef10c92f62f58b1e9ef472fa475a9b9ef01f74ee9e9463494f346d492faf2
font_02_sfnt_off0001ac06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC06 18652 bytes
SHA-256: 631437acc96279dc96d3c682275e4a99ceaf192931edec30f4f090811d0a7658

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