Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db420dfc82cf164…

MALICIOUS

PDF

139.5 KB Created: 2021-06-29 02:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d5b65c0ded70da79029be78ebe2d9a33 SHA-1: 59dc1b00400949942a4287a4efbc818b749d6247 SHA-256: 5db420dfc82cf1649cee2aa8df08b0b700947bb9422b451e32e81a775665ff01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. This suggests the document is designed to act as a link farm, potentially leading users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9376

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad92c8ac---kamebosaborezetopuzetagex.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8c7a0bfc8f0ad5e836e1f79c1b476785/bozovozejalamasadumitoti.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sasolipaj.pdfIn PDF document text
    • http://slsnn.ru/content/files/jidixukeludi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/84fd18e71351f9ff74a78375696cc3bb/jumogusodofudabot.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d943448d39d69d3657850b9d485653f6/zufinimefunadoxuxer.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/fepodebedotesezi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/noxawevaninibupofi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703008efe54---zejirar.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cc2d3b60---simoluwuriwomunajeme.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/sabenumikevebizudozime.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1e5mq9125a8vbf0h5p20617qe3/12657224469.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160925f14af2ad---46873293016.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/92050102924.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dde6e8269---boguwu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c875b796c1---xafafuvu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/dilevozutevobil.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5a1f2f8778b4dd4d47a2b21b170f3801/funulabamifokugom.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8023203da8---57667666709.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863bd3050fe---nemipazigosodoroju.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/4772e2b07c3ba7e9ccbcee1d9953a36c/38433197917.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/67809177901.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cad0d387d783afefb5f91ce8c5a6a9dc/82246264453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=one+piece+strong+world+english+subPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FB 17816 bytes
SHA-256: f08d0cc8e1727a8b7b01a0b6c20184ea0a87a54dbec9d96010620d3748a95680
font_01_sfnt_off000187c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C4 27920 bytes
SHA-256: a8ee8324b02b6c599ff36494aeba2c0e0850d4abc7fa4e23e4172f6cc82b7f9f
font_02_sfnt_off0001d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8D6 10980 bytes
SHA-256: c3d0d57144b4605e8455e5c51a43de5d1c8488417286c351133730adf4177cc6
font_03_sfnt_off0001f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E1 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_04_sfnt_off0002078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2078E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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