Malicious PDF — malware analysis report

Static analysis result for SHA-256 123c0f522128b1d6…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 02:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e77a5493278418cefe140e58db634d9b SHA-1: 76ca572033bcc4ffdc762dc23b11a33f3353601a SHA-256: 123c0f522128b1d6bf983550f415809e6232856269ebb57cb10f8808137c76cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of a 'clipboard command execution lure' heuristic indicates the likely goal is to trick the user into running commands, potentially to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6e26ffa8---botozon.pdf In PDF document text
    • http://prinsart.ro/uploads/files/64142248252.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6f8ef3f6a753185c28d69a0bb9419ecf/gijadobegesiv.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fabc0beba---xisamunilululep.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/27726762587.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1b77f525---23623733931.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/acfadbbd658ca19f9e9436b86a979815/zonabiwufimavopogozilox.pdfIn PDF document text
    • https://luminex.pl/upload/file/bigipevowuwo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087167227853---48175264482.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/78354749419.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i191da7il370m7j296ef5tovm5/logorazexefegimuvaka.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gofesafan.pdfIn PDF document text
    • https://topupdana.com/contents//files/wipumewivedid.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1ffce7de---90463969261.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1486881b1f4426a618e3e93eb2e21858/ratomigodegon.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ndki3f11of5qe7at72tc4ntv8n/jekululuf.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ktt36bs2bbuborqlrqvpctn25o/tagowivolewezofikufapoti.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/74223552881.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/796a9f699e4fa2ff47ef742a58804bff/41649177136.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b20df892c09fd17154abcb8ce53a2a1d/11071721985.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/xudiriperamotowagepemari.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b1fojicfn5l7rva3a90t9erp8f/56839963174.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce406ebc9---bodakixoganedotowoziwen.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160712d3402f58---16155056337.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gazokoxijedikorilufoti.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/b1fe5b75ae7c1b21e0720b3f4e2e8afa/solawukititeladov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+you+copy+an+image+from+a+pdfPDF 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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 17816 bytes
SHA-256: da564cd412538f560cb2b2a584977b067cac0e0168766f2042f9f6a379fe4a14
font_01_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10896 bytes
SHA-256: 43340dcc07398295a543758e35e98c30ebdf28826b6ae98ac9713d0908aa2e89
font_02_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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