Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c920e51239c116…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 10:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95eb9f282eae93cc98c718aae05a2fe4 SHA-1: 0dfdb082e5f9bb6e6f29eeb1a69202d46d32cb8e SHA-256: 51c920e51239c116b86845426b71e69b71bef57654cba26aeaa7efc0d75a6d35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded links, many pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The presence of PDF_RANDOM_URL_LINK indicates an attempt to obscure the final destination, likely a malicious PDF payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16120474ebdce7---podarijovegefupirogaxo.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62f3aa9bd8df0ba6109c532e66cbbd17/73529883365.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/94600957837.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/616a013a73e98ac740492158f9202230/kinuputopomobugebal.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/55610566094.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/99ab171d78f147fbfbf14445b8dce1f7/nubekikerozamijoxoxono.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1386c9778b2c2da319cfa906042276f6/zutogu.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/sugutugofaw.pdfIn PDF document text
    • https://ewt.cz/res/file/50790499446.pdfIn PDF document text
    • https://fishuntpesca.it/file/49120023119.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/33609243884.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607844bf1edd5---bigirofafavukomatalurunef.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hqjfo719lgupkmlncmqqs0viud/83525122699.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/kibujelikexuposediwofeges.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf643a46422---diweluveranukakusiniwi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4uc17d9nqrpksmumvs934qbka2/9100634964.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/tetunulewazubudozoridew.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ijlb9ivmn79d8mu67ucsl7o2c6/dadojilop.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085e33b66b1e---mexibamamekuxof.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tataji.pdfIn PDF document text
    • http://ashioke.com/images/library/File/22891724003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yamaha+superjet+2006+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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10928 bytes
SHA-256: 24cd8185cc1c09a99049d3e6d8ba46be5bb2b00156ec41b2c87f0d60991e50a8
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 18040 bytes
SHA-256: a7d0adbd0c9dafd22c973320b9c90f06374244c21e2fe5bbae9e1ba30b08ab3c
font_02_sfnt_off00013d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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