Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef4d1b93c21af81…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 13:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f2ffdb612b7b48e0ca5db8a706086e3 SHA-1: c2eda16308fc728e89da453bc8fd9ae6a8b17e06 SHA-256: 4ef4d1b93c21af81a50c9e5931c71047801dbdde2edc010660621c1b2ca648c6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b24b9108c477ed506197ac23fd7b5dcb/59201063007.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3eaf01209---sulujetapimiwativanovuxu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5cebffbf---1850148549.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/nubumazozinofulaxo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219404383e2---tumexiveku.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fece947e6d312dadb457fa99cb22b70c/fezubebizoz.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/87416684643.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7dbae6db1---dojumopuki.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/39535634908.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gnk7u8es60m3un7v05f7385q75/42237356521.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jijonipizefofazizozifu.pdfIn PDF document text
    • https://adikketiga.com/contents/files/winoxoterekuzapojazemed.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/nozewevado.pdfIn PDF document text
    • http://robedecreateur.com/img/files/xomuvilegut.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/72e69215db03a77cbb804e366fff9b2b/75560826286.pdfIn PDF document text
    • http://dogable.de/userfiles/file/24475200766.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/40843880869.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/47308452402.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/53669521625.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/34796704117.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/81763141829.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29934b644---30749057662.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3b7e0be256fb48b280a7bb6a54af73b6/25332903449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=positivism+interpretivism+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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 17720 bytes
SHA-256: 9016f759fde17fbccbf353c5cc7db92079c375aba5583e6dc7496ef68f313e00
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10516 bytes
SHA-256: f3d558d2ae3bbd5c5163d6e2b2e83cba7cddb6578086ebd61b5b3416848532d8
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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