Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cb86b9733b7dc3…

MALICIOUS

PDF

87.9 KB Created: 2021-10-05 01:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2006a0bf8b02c9b7a753c33fcb2f307f SHA-1: 1b7404442bff31e2b6c17f4e407a014d0a2981f4 SHA-256: 75cb86b9733b7dc361fa2d1ae8c34819eecca1346e299129f13d6040874a89df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tysons-cafe.com/uploads/files/jamoserobofenaruta.pdf In PDF document text
    • http://a2hgghk.handylover.com/upload/files/2395846002.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/wedakorisujoxiz.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/28268148786.pdfIn PDF document text
    • http://staropolski.net/Upload/file/60322821738.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614df9b80e300---zukasipijaw.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/37544699425.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a43c3a820c7fb2cdcfedc9f2a5f8264d/97377756997.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/58735351836.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/mibagatarido.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/1986502316.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zojalejoselodixed.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/81022739277.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/fozuwomisizaginulerisetox.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/totetuzilipubifuwav.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/senolisifubiworesasetomo.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/pimoguritera.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/63278743579.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/19760431987.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-10-2/20211002192919112797.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16155a0f19b189---72210788961.pdfIn PDF document text
    • http://www.grifin.sk/files/33465859349.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/560480744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=different+types+of+stewPDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10344 bytes
SHA-256: 010dbff45944a6f8a4a894c8899dd42437f78169fc2aa6ac641def2ee0aaba3b
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 20164 bytes
SHA-256: 542637fe282dd535bc6547f9c163866591190ca28e886a18e37f410ef282e208