Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dbb7e2523f1e8a…

MALICIOUS

PDF

74.4 KB Created: 2021-07-17 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 317629f8bf61b1e6d69cf6188505a7d9 SHA-1: 420146e29c209a2837cfb49092a35229e4a834aa SHA-256: a8dbb7e2523f1e8a436d75ff7d3d579dc85737013767b6a055bd38159e93dfd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to host or distribute further malicious content. The presence of numerous links on disposable hosting and compromised CMS uploads strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc24d4388a2---xojuxutuzakoxaxajotipu.pdf In PDF document text
    • http://vce34.ru/attachments/file/mezosaxasakam.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/29819154340.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1dd5f8e66759f05db7d02597e4d7a88b/tinasusemazakafaf.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20653cc0a2---tawut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9eadf3a4---gulisimikebufiwe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/877d560cc6622028858a83cadc9e330e/nebinamekajedusinukegave.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/kalasijutemineteloxukis.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/01iflk7u9gattnnhsfq964f0a4/31564939859.pdfIn PDF document text
    • http://c-amc.com/upload/files/49145086869.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c51a0bb1640---67263336513.pdfIn PDF document text
    • http://teraval.cz/res/file/wupiz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab903cc3005---fofeliloginetif.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/53597238110.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/17985953310.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/20941998287.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a60610c488130b7c70767e2855d51885/nabajobogubovibimofos.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6c64cc9deebb550785384f7dd13adff6/fepetamanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=solid+yellow+colourPDF 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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 10204 bytes
SHA-256: 97fc575028c29a64ff0f3778bdc2e4e7c292b4925f560f4952fa88d46f71767d
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 16516 bytes
SHA-256: 98cb4bfeae895f897d647b06aa274b7a6fb33e6c402fe2c2c3e99634f29d8e4f
font_02_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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