Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf026e47fc47f74…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 10:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce68d6bce20d4c22c2124547204230a2 SHA-1: a68552d6ad22a4201d96031d4598f063e1b780d5 SHA-256: bcf026e47fc47f74f8c1ca2836d9457eb0d48780c90c323c520e96b8a21e646b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of multiple external URIs and link farms indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=stealth+spyware+for+android PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe19aeb73---buwesubaxawa.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/3926522676.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f70e7c91a---lupobegamizisebixuvito.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fesevobarol.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/welomur.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/6113126466.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/96961067832.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/mikapi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c8766395---35538421668.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/navid.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/legelejawom.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/gakemevuruxezol.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a305d29e9e5a1eec0980c059d7a82b66/mobevemumajunumipavefu.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/dikurixofe.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/faxoda.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/zixubekamexogowavosivev.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/69147266336.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613383d8e873b---nejigozuranuruzuju.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/51918208852.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/50191161796.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/86888328399.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/23833546486.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bemebumixewodixigetikusaz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c8f01083d1---sikaneravuvosikajabaf.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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10872 bytes
SHA-256: d0abc6bffbde8610612e55fd563d484d3a2d9979d8f33934f19d076cf32bfa32
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 17772 bytes
SHA-256: aef5784d3581e458d8cadd87d6f5f344e97ac1969c6cd2b1da0531748185307c

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