Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d169dbcf6c8b11…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 02:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d7c083ded97351a33aab67bc37699ab SHA-1: 86aa5fea66d5769129e89a2b5b65692cc391fced SHA-256: 78d169dbcf6c8b11904991643e73b9e0d87082727476a9b5978dcd6081cf81d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to links on compromised WordPress upload storage. These elements collectively suggest the PDF's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lumieretvie.com/userfiles/file/82327687118.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacda953d8---vumob.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/26342647630.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/sanadotetogovutug.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/bofujonovisudef.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ca2ahcn9hmv5ibj368cj7ae5f0/nigobadineposisaxem.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edda276bdf---lojobasawixupujewa.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607650f00b9c8---vivosuwofurilud.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/tewazasukap.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/donaxagoruguboroxo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702185517059.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ad02a7ad---nedenumojabifuwemo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/586e0f7647339c326ddaaba5fbf375f4/xixofevonopegekumun.pdfIn PDF document text
    • http://sahodayabbsr.com/test/fckeditor/file/34599867099.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa3b2e739---lajabetuzufoxugosavebof.pdfIn PDF document text
    • https://bloomeng.com/uploads/9029186707.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/desis.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8247cd884---7128891593.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/pubixujuvejilufiboguvawu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f7e9f2c9b6d699df0dd8ed1a0e68ef3/98371463530.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/linapupijelumo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f615f2c---mubatexesozukisuluwejofo.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/33256868680.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/korow.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/ruxenevimunenumusawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=math+pages+for+grade+4PDF 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_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 10604 bytes
SHA-256: 9d04d3a88a4c3208c98aeee957a321c46d19fd4ae3d9c27efcbc853fd91fc371
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16468 bytes
SHA-256: 31d22184a46b449a1c13b193d906b6a704c42b0128bc92e70d9fd375de72525c
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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