Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbea554c8838e0e0…

MALICIOUS

PDF

101.1 KB Created: 2021-08-10 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c91d786568e8dee329b71b7cc5c5ea91 SHA-1: e3301e013d1d622c75398212c4896783830cbf8d SHA-256: bbea554c8838e0e0a7dfabd1646078ae5f29c8b1283c97c8ecf9634f94ef0552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URIs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93f4441f7---32467450513.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0a09034a2e64ceda626b6b262c98b111/zivixoredara.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/55c21836d6b4cc0087afeda058049c9a/25885289739.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/duranowuratewanokisojowal.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d3nfes6k38jp1hrv5gf1itm70k/xekosise.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/xevosunowojegafus.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba71a2503b8---97372988120.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fe50b80e48973f7d935bd4364e75e83d/xubowoxetilurozigikeni.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/27a7a79dafb4b442619b71aef4cc1ef2/duximajogojezob.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/36434318102.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/93704408125.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076415307281---74804691187.pdfIn PDF document text
    • https://deepex.hu/hirek/files/182969325.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed23428d7f---56030486663.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761cfa179b4---waziduguderobumefamotenu.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/34229230077.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fbd4dca1e3ef365aa049833c5d2f2e01/80855589795.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/ojaak2vst7ho6kioe6m0seoa76/40504233845.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wozolutadesuwetunavuxeku.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0ca72454---jarisopiwi.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/rozepaxowomuruzaxixufem.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=santa+claus+is+comin+to+town+piano+tutorial+easyPDF 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_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 10912 bytes
SHA-256: 1511580bcbea6128775a2b481d39ce6a7c8158b2ccc85a9f8242b6f82cc952f1
font_01_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 19868 bytes
SHA-256: b3d3766075373f1ffaf18a81d58cbc386a560c2d39e97ff2019d3f705a7d5e31
font_02_sfnt_off00016b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1