Malicious PDF — malware analysis report

Static analysis result for SHA-256 8487fceb9261b344…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 13:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 27a8f9fb83386fc4531c438c79e002c1 SHA-1: 50e9b068a19d4d54b6ff68d29d1f51bb7f0fc81f SHA-256: 8487fceb9261b344127df1d7f6c4a383e171f509a58acf02a990b7ce028a9def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.medicellbank.com/userfiles/files/tudirevoxegewotese.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e4d57bba---karedumumexevafaxiz.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/49353087302.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/91187315457.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/50556782414.pdfIn PDF document text
    • http://licausi.it/userfiles/files/nebojaxupazatureturipe.pdfIn PDF document text
    • http://hibertek.com/image/files/20210915_232828.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f7352a01536c7b97ead1d1d95fbf81d7/98491965558.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/19267786136.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/59146718456.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/38309712231.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/96981540911.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/60700569141.pdfIn PDF document text
    • http://potya.com/walonez.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f294edc23---33694520289.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/37827766515.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/fajadolowesoxuxezawopevep.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/pulejizeranude.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/27429320188.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/6026950631.pdfIn PDF document text
    • http://medi-sen.com/files/files/gupifulefepup.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52654c1d585981257ae6499a8f0a8e3f/77606724468.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/lupulodazi.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/zibuvikojarobakokomusewel.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd95737c1067623dba74bdd9ea2593dd/nivixo.pdfIn PDF document text
    • https://beautydent.hu/editor_up/57538421255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+police+scanner+app+for+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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16908 bytes
SHA-256: c29b225912f72cfafec70017b93c59650e86579f23b16d306cb65a5d3d0f7858
font_02_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 10668 bytes
SHA-256: 177dde2ae67db296f82d1052ebdcefa909c44a228783e0ee3b4c87a8848d4499