Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb046eb2e460aa62…

MALICIOUS

PDF

95.3 KB Created: 2021-09-08 08:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 508521e588ab67b9546391934301728c SHA-1: 325fcaad92cdbe17c5b00e06b679be82b91903f1 SHA-256: fb046eb2e460aa623ed71dc60163154236f18aefb9872480be206ace89fefe2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.iieng.org/editor/ckfinder/userfiles/files/jawun.pdf In PDF document text
    • https://jordan.si/dokumenti/file/84242419048.pdfIn PDF document text
    • https://blogsma.com/files/50530382051.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e7252d2353de4977ef516d0acce38a0d/baxesag.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5937044c3d---57694065239.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92b56f274---vavowavoroxatinozego.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/sotaxoviwe.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dd701e8cc7e6fd9b7304b98a413f3753/28383057935.pdfIn PDF document text
    • http://kccmaul.com/files/files/dulun.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/nezukiwuzowujuzulosasupe.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/23699481416.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a3ae13c89841b4ce297a7942b8518560/jowugiregop.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/8645480098.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be2c2cf77---zolomuwawurelomekef.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/laxijam.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/nokedaripusozufat.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f412b99644d---37034060642.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd8e4dbb4---ritaser.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/wizabebawerapotakovog.pdfIn PDF document text
    • http://guowangcable.com/d/files/63149111250.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/77430889618.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pigut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=osha+rules+and+regulations+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_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 17696 bytes
SHA-256: 3e2e0b12da0f84380780d6077cc1a96d566df46b6288499b30ae76d241bad00e
font_01_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 10904 bytes
SHA-256: e8981e8c75227e4f861cc66944ed13dbe37d19a3cd181dea1c302b7d56ac6fb4

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