Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5710696bf6ab5e…

MALICIOUS

PDF

120.5 KB Created: 2021-10-08 19:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d89fcfdff7a3b228c072ceeddadb3d4b SHA-1: c463f1d3881d222a946638e05bb8d1f4bc8ab1c1 SHA-256: 0e5710696bf6ab5e712a4cccd8197b15312b8defbcf3d18b2bf39ac55b73b6eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=there%27s+not+a+friend+thomas+whitfield+lyrics PDF link annotation
    • https://picinterior.com/ckfinder/userfiles/files/munazoxawe.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55376828717.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/timikipoxojejiwaxevojuv.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/9751569018.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/bewurajunamuzotabeg.pdfIn PDF document text
    • http://budropol.de/Upload/file/duxagutavumamatufaro.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494542f68e---soxibuwodu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/wesokiwubetuv.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/67280414362.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/55063997924.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/66744961201.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/xunozudojadarikuwoj.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/55443479054.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/7161839733.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/fuvuwum.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/rijivumogerepuzinu.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/94044423684.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bozitixa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615b3a05586ee---50049953633.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/rasinemumiliwijam.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161444d3b9c2f2---28960245784.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/94709025196.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/49753760923.pdfIn PDF document text
    • 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_off00016889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001809b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809B 22784 bytes
SHA-256: dde45aaaa66c26bebd7393c850ca462c21ddb9d4ac242186371bfe0f2ab2094c
font_02_sfnt_off0001ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA56 10940 bytes
SHA-256: 90f5d216b97e7bd58d678459726636dd42e1ec6823d7ec72a549b6f7eae3a261