Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaddb0634126cd6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 22:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a783db82946079f3fa062e5ab3ec25a6 SHA-1: 18a6ace9e2da46305eab4723240a10a4ffaf4b8c SHA-256: 6aaddb0634126cd64267b6c27d77de10751a9710df92d5d6fe0e5b182f6ab959
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external URLs strongly suggests a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://c2r-auto.com/uploadfiles/file/2021060123501273499.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef52aff2a---sajakuvogoxuxejobe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf3546faa---borasedutemabijawabesarer.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/c3slmr4aff6ikorn0uabf5q8tr/26731841605.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1f9fe9b54977ef25f8b1755c5e4e5f35/37662552714.pdfIn PDF document text
    • https://makenie.com/upload/files/51976139911.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mawopinelusejitotumoxulik.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b794c8f2e8c---88777574839.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/81917448619.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/70234057479.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/76032964039.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/6043826465.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/59c1c9c802bc56a36b63c86c24cacfea/rogoxegilebuzilekepa.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/gukelaxe.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/punadagulisakexuvutebine.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210718093626.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa157eae6.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/24629800278.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715f64393d---jaxixipoposowofuvateko.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be720c9b546---zutatozodizisozumirabef.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1ae96638---12304992804.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qmilk24g25qem8op13n7o742na/88765701803.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/76422260477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=data+transmission+in+networkingPDF 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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 10584 bytes
SHA-256: 09f43eac694a65aebf38ac8301bbb55313e72bb4beaafff906845a77bc6658ad
font_02_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 16660 bytes
SHA-256: 0f51c68d85e680730c3893eb520a99ab79439be7104dd4ef2ed52c07f6e468c4

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