Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ff541347da22b6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 17:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: afd0367a027de1c4f23f95b2eccb525f SHA-1: cb506ff7b5aad3970ed5ab59a327b97c6eb1c0a9 SHA-256: 33ff541347da22b69ffddb615c28b10b0a453e3a2cf50b9dadb1dd89895b5158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm hosted on compromised WordPress sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files, suggesting a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e911b9470e---30864852448.pdf In PDF document text
    • http://khonggianmang.com/upload/files/gafupakikesame.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/fafafawofaxivobuxukex.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tototi.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/pamigamovanawilepamunide.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sagojekika.pdfIn PDF document text
    • http://marymo.ru/uploads/files/moxogozolefawitarej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0f4a20ef---teramugawajo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d54d6dcf7818f01d7bd6b53168cd195/jasibexem.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/16805067130.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44205f63d---linejusaju.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/76017961849.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/21420006006.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/83066854064.pdfIn PDF document text
    • http://i-dron.cz/data/file/nejixululilumuninuku.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dabaxawolezi.pdfIn PDF document text
    • https://tdfstore.it/file/zitotivanam.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/semodepigutanidizaxane.pdfIn PDF document text
    • https://ikansambel.com/contents/files/josofudaga.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/47776449242.pdfIn PDF document text
    • http://naso10.com/userData/board/file/93945589585.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161355b00e63c6---lomawiji.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/6421201066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=install+gta+3+androidPDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10416 bytes
SHA-256: d3cc3a6c1ed201282eadb73aca342a5eb9313bf941ff3ebc2300b35c5a7d92b4
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 19228 bytes
SHA-256: 033e926a691559be0bce20ff28dfbdfceb72694a0a571fc35a033d80ccebffe8

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